diff --git a/src/actor.h b/src/actor.h
index 1510a5787c..863e4fb46a 100644
--- a/src/actor.h
+++ b/src/actor.h
@@ -886,6 +886,12 @@ public:
 
 
 	// a full 3D version of the above
+	double Distance3DSquared(AActor *other, bool absolute = false)
+	{
+		DVector3 otherpos = absolute ? other->Pos() : other->PosRelative(this);
+		return (Pos() - otherpos).LengthSquared();
+	}
+
 	double Distance3D(AActor *other, bool absolute = false)
 	{
 		DVector3 otherpos = absolute ? other->Pos() : other->PosRelative(this);
diff --git a/src/compatibility.cpp b/src/compatibility.cpp
index 8c3cc16c5c..b99f2a51b0 100644
--- a/src/compatibility.cpp
+++ b/src/compatibility.cpp
@@ -92,6 +92,7 @@ enum
 	CP_SETTHINGSKILLS,
 	CP_SETSECTORTEXTURE,
 	CP_SETSECTORLIGHT,
+	CP_SETLINESECTORREF,
 };
 
 // EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
@@ -283,6 +284,18 @@ void ParseCompatibility()
 					CompatParams.Push(sc.Number);
 				}
 			}
+			else if (sc.Compare("setlinesectorref"))
+			{
+				if (flags.ExtCommandIndex == ~0u) flags.ExtCommandIndex = CompatParams.Size();
+				CompatParams.Push(CP_SETLINESECTORREF);
+				sc.MustGetNumber();
+				CompatParams.Push(sc.Number);
+				sc.MustGetString();
+				CompatParams.Push(sc.MustMatchString(LineSides));
+				sc.MustGetNumber();
+				CompatParams.Push(sc.Number);
+				flags.CompatFlags[SLOT_BCOMPAT] |= BCOMPATF_REBUILDNODES;
+			}
 			else if (sc.Compare("clearlinespecial"))
 			{
 				if (flags.ExtCommandIndex == ~0u) flags.ExtCommandIndex = CompatParams.Size();
@@ -719,6 +732,22 @@ void SetCompatibilityParams()
 					i += 3;
 					break;
 				}
+				case CP_SETLINESECTORREF:
+				{
+					if ((unsigned)CompatParams[i + 1] < level.lines.Size())
+					{
+						line_t *line = &level.lines[CompatParams[i + 1]];
+						assert(line != nullptr);
+						side_t *side = line->sidedef[CompatParams[i + 2]];
+						if (side != nullptr && (unsigned)CompatParams[i + 3] < level.sectors.Size())
+						{
+							side->sector = &level.sectors[CompatParams[i + 3]];
+						}
+					}
+					i += 4;
+					break;
+				}
+
 			}
 		}
 	}
diff --git a/src/d_dehacked.cpp b/src/d_dehacked.cpp
index 92d574d699..ddabdb7721 100644
--- a/src/d_dehacked.cpp
+++ b/src/d_dehacked.cpp
@@ -2840,14 +2840,14 @@ static bool LoadDehSupp ()
 					sc.MustGetString();
 					PClassActor *actortype = static_cast<PClassActor *>(type);
 					s.State = actortype->FindState(sc.String);
-					if (s.State == NULL)
+					if (s.State == NULL && addit)
 					{
 						sc.ScriptError("Invalid state '%s' in '%s'", sc.String, type->TypeName.GetChars());
 					}
 
 					sc.MustGetStringName(",");
 					sc.MustGetNumber();
-					if (s.State == NULL || sc.Number < 1 || !actortype->OwnsState(s.State + sc.Number - 1))
+					if (addit && (s.State == NULL || sc.Number < 1 || !actortype->OwnsState(s.State + sc.Number - 1)))
 					{
 						sc.ScriptError("Invalid state range in '%s'", type->TypeName.GetChars());
 					}
diff --git a/src/g_shared/hudmessages.cpp b/src/g_shared/hudmessages.cpp
index 722fb353df..32465f7b10 100644
--- a/src/g_shared/hudmessages.cpp
+++ b/src/g_shared/hudmessages.cpp
@@ -40,15 +40,18 @@
 #include "cmdlib.h"
 #include "doomstat.h"
 #include "serializer.h"
+#include "vm.h"
 
 EXTERN_CVAR(Int, con_scaletext)
 
-IMPLEMENT_CLASS(DHUDMessage, false, true)
-
-IMPLEMENT_POINTERS_START(DHUDMessage)
-	IMPLEMENT_POINTER(Next)
+IMPLEMENT_CLASS(DHUDMessageBase, true, true)
+IMPLEMENT_POINTERS_START(DHUDMessageBase)
+IMPLEMENT_POINTER(Next)
 IMPLEMENT_POINTERS_END
 
+
+IMPLEMENT_CLASS(DHUDMessage, false, false)
+
 IMPLEMENT_CLASS(DHUDMessageFadeOut, false, false)
 IMPLEMENT_CLASS(DHUDMessageFadeInOut, false, false)
 IMPLEMENT_CLASS(DHUDMessageTypeOnFadeOut, false, false)
@@ -57,6 +60,68 @@ IMPLEMENT_CLASS(DHUDMessageTypeOnFadeOut, false, false)
  * Basic HUD message. Appears and disappears without any special effects *
  *************************************************************************/
 
+void DHUDMessageBase::Serialize(FSerializer &arc)
+{
+	Super::Serialize(arc);
+	arc("next", Next)
+		("sbarid", SBarID);
+}
+
+DEFINE_ACTION_FUNCTION(DHUDMessageBase, Tick)
+{
+	PARAM_SELF_PROLOGUE(DHUDMessageBase);
+	ACTION_RETURN_BOOL(self->Tick());
+}
+
+DEFINE_ACTION_FUNCTION(DHUDMessageBase, ScreenSizeChanged)
+{
+	PARAM_SELF_PROLOGUE(DHUDMessageBase);
+	self->ScreenSizeChanged();
+	return 0;
+}
+
+DEFINE_ACTION_FUNCTION(DHUDMessageBase, Draw)
+{
+	PARAM_SELF_PROLOGUE(DHUDMessageBase);
+	PARAM_INT(bottom);
+	PARAM_INT(visibility);
+	self->Draw(bottom, visibility);
+	return 0;
+}
+
+bool DHUDMessageBase::CallTick()
+{
+	IFVIRTUAL(DHUDMessageBase, Tick)
+	{
+		VMValue params[] = { (DObject*)this };
+		int retval;
+		VMReturn ret; ret.IntAt(&retval);
+		VMCall(func, params, countof(params), &ret, 1);
+		return !!retval;
+	}
+	return Tick();
+}
+
+void DHUDMessageBase::CallScreenSizeChanged()
+{
+	IFVIRTUAL(DHUDMessageBase, ScreenSizeChanged)
+	{
+		VMValue params[] = { (DObject*)this };
+		VMCall(func, params, countof(params), nullptr, 0);
+	}
+	else ScreenSizeChanged();
+}
+
+void DHUDMessageBase::CallDraw(int bottom, int visibility)
+{
+	IFVIRTUAL(DHUDMessageBase, Draw)
+	{
+		VMValue params[] = { (DObject*)this, bottom, visibility };
+		VMCall(func, params, countof(params), nullptr, 0);
+	}
+	else Draw(bottom, visibility);
+}
+
 //============================================================================
 //
 // DHUDMessage Constructor
@@ -130,7 +195,6 @@ DHUDMessage::DHUDMessage (FFont *font, const char *text, float x, float y, int h
 	WrapWidth = 0;
 	HandleAspect = true;
 	Top = y;
-	Next = NULL;
 	Lines = NULL;
 	HoldTics = (int)(holdTime * TICRATE);
 	Tics = 0;
@@ -184,10 +248,8 @@ void DHUDMessage::Serialize(FSerializer &arc)
 		("tics", Tics)
 		("state", State)
 		.Enum("textcolor", TextColor)
-		("sbarid", SBarID)
 		("sourcetext", SourceText)
 		("font", Font)
-		("next", Next)
 		("hudwidth", HUDWidth)
 		("hudheight", HUDHeight)
 		("nowrap", NoWrap)
diff --git a/src/g_statusbar/sbar.h b/src/g_statusbar/sbar.h
index 42b164e2bd..ba3d379b86 100644
--- a/src/g_statusbar/sbar.h
+++ b/src/g_statusbar/sbar.h
@@ -59,10 +59,34 @@ bool ST_IsLatencyVisible();
 
 // HUD Message base object --------------------------------------------------
 
-class DHUDMessage : public DObject
+// This is a mo-op base class to allow derived ZScript message types that can be managed by the status bar.
+class DHUDMessageBase : public DObject
 {
-	DECLARE_CLASS (DHUDMessage, DObject)
+	DECLARE_CLASS(DHUDMessageBase, DObject)
 	HAS_OBJECT_POINTERS
+
+public:
+	virtual void Serialize(FSerializer &arc);
+	virtual bool Tick() { return true; }	// Returns true to indicate time for removal
+	virtual void ScreenSizeChanged() {}
+	virtual void Draw(int bottom, int visibility) {}
+
+	bool CallTick();	// Returns true to indicate time for removal
+	void CallScreenSizeChanged();
+	void CallDraw(int bottom, int visibility);
+
+private:
+	TObjPtr<DHUDMessageBase*> Next = nullptr;
+	uint32_t SBarID = 0;
+	friend class DBaseStatusBar;
+
+};
+
+// HUD Message  --------------------------------------------------
+
+class DHUDMessage : public DHUDMessageBase
+{
+	DECLARE_CLASS (DHUDMessage, DHUDMessageBase)
 public:
 	DHUDMessage (FFont *font, const char *text, float x, float y, int hudwidth, int hudheight,
 		EColorRange textColor, float holdTime);
@@ -70,12 +94,12 @@ public:
 
 	virtual void Serialize(FSerializer &arc);
 
-	void Draw (int bottom, int visibility);
+	virtual void Draw (int bottom, int visibility) override;
 	virtual void ResetText (const char *text);
 	virtual void DrawSetup ();
 	virtual void DoDraw (int linenum, int x, int y, bool clean, int hudheight);
-	virtual bool Tick ();	// Returns true to indicate time for removal
-	virtual void ScreenSizeChanged ();
+	virtual bool Tick () override;
+	virtual void ScreenSizeChanged () override;
 
 	void SetVisibility(int vis)
 	{
@@ -130,11 +154,8 @@ protected:
 	DHUDMessage () : SourceText(NULL) {}
 
 private:
-	TObjPtr<DHUDMessage*> Next;
-	uint32_t SBarID;
 	char *SourceText;
 
-	friend class DBaseStatusBar;
 };
 
 // HUD message visibility flags
@@ -360,9 +381,9 @@ public:
 	void SetSize(int reltop = 32, int hres = 320, int vres = 200, int hhres = -1, int hvres = -1);
 	void OnDestroy() override;
 
-	void AttachMessage (DHUDMessage *msg, uint32_t id=0, int layer=HUDMSGLayer_Default);
-	DHUDMessage *DetachMessage (DHUDMessage *msg);
-	DHUDMessage *DetachMessage (uint32_t id);
+	void AttachMessage (DHUDMessageBase *msg, uint32_t id=0, int layer=HUDMSGLayer_Default);
+	DHUDMessageBase *DetachMessage (DHUDMessageBase *msg);
+	DHUDMessageBase *DetachMessage (uint32_t id);
 	void DetachAllMessages ();
 	void ShowPlayerName ();
 	double GetDisplacement() { return Displacement; }
@@ -455,7 +476,7 @@ private:
 	void DrawWaiting () const;
 	void SetDrawSize(int reltop, int hres, int vres);
 
-	TObjPtr<DHUDMessage*> Messages[NUM_HUDMSGLAYERS];
+	TObjPtr<DHUDMessageBase*> Messages[NUM_HUDMSGLAYERS];
 
 	int BaseRelTop;
 	int BaseSBarHorizontalResolution;
diff --git a/src/g_statusbar/shared_sbar.cpp b/src/g_statusbar/shared_sbar.cpp
index 22ab540359..d9fa88cc2e 100644
--- a/src/g_statusbar/shared_sbar.cpp
+++ b/src/g_statusbar/shared_sbar.cpp
@@ -410,10 +410,10 @@ void DBaseStatusBar::OnDestroy ()
 {
 	for (size_t i = 0; i < countof(Messages); ++i)
 	{
-		DHUDMessage *msg = Messages[i];
+		DHUDMessageBase *msg = Messages[i];
 		while (msg)
 		{
-			DHUDMessage *next = msg->Next;
+			DHUDMessageBase *next = msg->Next;
 			msg->Destroy();
 			msg = next;
 		}
@@ -594,14 +594,14 @@ void DBaseStatusBar::Tick ()
 {
 	for (size_t i = 0; i < countof(Messages); ++i)
 	{
-		DHUDMessage *msg = Messages[i];
-		DHUDMessage **prev = &Messages[i];
+		DHUDMessageBase *msg = Messages[i];
+		DHUDMessageBase **prev = &Messages[i];
 
 		while (msg)
 		{
-			DHUDMessage *next = msg->Next;
+			DHUDMessageBase *next = msg->Next;
 
-			if (msg->Tick ())
+			if (msg->CallTick ())
 			{
 				*prev = next;
 				msg->Destroy();
@@ -662,10 +662,10 @@ void DBaseStatusBar::CallTick()
 //
 //---------------------------------------------------------------------------
 
-void DBaseStatusBar::AttachMessage (DHUDMessage *msg, uint32_t id, int layer)
+void DBaseStatusBar::AttachMessage (DHUDMessageBase *msg, uint32_t id, int layer)
 {
-	DHUDMessage *old = NULL;
-	DHUDMessage **prev;
+	DHUDMessageBase *old = NULL;
+	DHUDMessageBase **prev;
 	DObject *container = this;
 
 	old = (id == 0 || id == 0xFFFFFFFF) ? NULL : DetachMessage (id);
@@ -697,18 +697,28 @@ void DBaseStatusBar::AttachMessage (DHUDMessage *msg, uint32_t id, int layer)
 	GC::WriteBarrier(container, msg);
 }
 
+DEFINE_ACTION_FUNCTION(DBaseStatusBar, AttachMessage)
+{
+	PARAM_SELF_PROLOGUE(DBaseStatusBar);
+	PARAM_OBJECT(msg, DHUDMessageBase);
+	PARAM_UINT(id);
+	PARAM_INT(layer);
+	self->AttachMessage(msg, id, layer);
+	return 0;
+}
+
 //---------------------------------------------------------------------------
 //
 // PROC DetachMessage
 //
 //---------------------------------------------------------------------------
 
-DHUDMessage *DBaseStatusBar::DetachMessage (DHUDMessage *msg)
+DHUDMessageBase *DBaseStatusBar::DetachMessage (DHUDMessageBase *msg)
 {
 	for (size_t i = 0; i < countof(Messages); ++i)
 	{
-		DHUDMessage *probe = Messages[i];
-		DHUDMessage **prev = &Messages[i];
+		DHUDMessageBase *probe = Messages[i];
+		DHUDMessageBase **prev = &Messages[i];
 
 		while (probe && probe != msg)
 		{
@@ -725,12 +735,20 @@ DHUDMessage *DBaseStatusBar::DetachMessage (DHUDMessage *msg)
 	return NULL;
 }
 
-DHUDMessage *DBaseStatusBar::DetachMessage (uint32_t id)
+DEFINE_ACTION_FUNCTION(DBaseStatusBar, DetachMessage)
+{
+	PARAM_SELF_PROLOGUE(DBaseStatusBar);
+	PARAM_OBJECT(msg, DHUDMessageBase);
+	ACTION_RETURN_OBJECT(self->DetachMessage(msg));
+}
+
+
+DHUDMessageBase *DBaseStatusBar::DetachMessage (uint32_t id)
 {
 	for (size_t i = 0; i < countof(Messages); ++i)
 	{
-		DHUDMessage *probe = Messages[i];
-		DHUDMessage **prev = &Messages[i];
+		DHUDMessageBase *probe = Messages[i];
+		DHUDMessageBase **prev = &Messages[i];
 
 		while (probe && probe->SBarID != id)
 		{
@@ -747,6 +765,13 @@ DHUDMessage *DBaseStatusBar::DetachMessage (uint32_t id)
 	return NULL;
 }
 
+DEFINE_ACTION_FUNCTION(DBaseStatusBar, DetachMessageID)
+{
+	PARAM_SELF_PROLOGUE(DBaseStatusBar);
+	PARAM_INT(id);
+	ACTION_RETURN_OBJECT(self->DetachMessage(id));
+}
+
 //---------------------------------------------------------------------------
 //
 // PROC DetachAllMessages
@@ -757,18 +782,26 @@ void DBaseStatusBar::DetachAllMessages ()
 {
 	for (size_t i = 0; i < countof(Messages); ++i)
 	{
-		DHUDMessage *probe = Messages[i];
+		DHUDMessageBase *probe = Messages[i];
 
 		Messages[i] = NULL;
 		while (probe != NULL)
 		{
-			DHUDMessage *next = probe->Next;
+			DHUDMessageBase *next = probe->Next;
 			probe->Destroy();
 			probe = next;
 		}
 	}
 }
 
+DEFINE_ACTION_FUNCTION(DBaseStatusBar, DetachAllMessages)
+{
+	PARAM_SELF_PROLOGUE(DBaseStatusBar);
+	self->DetachAllMessages();
+	return 0;
+}
+
+
 //---------------------------------------------------------------------------
 //
 // PROC ShowPlayerName
@@ -940,7 +973,7 @@ void DBaseStatusBar::FlashCrosshair ()
 
 void DBaseStatusBar::DrawMessages (int layer, int bottom)
 {
-	DHUDMessage *msg = Messages[layer];
+	DHUDMessageBase *msg = Messages[layer];
 	int visibility = 0;
 
 	if (viewactive)
@@ -953,8 +986,8 @@ void DBaseStatusBar::DrawMessages (int layer, int bottom)
 	}
 	while (msg)
 	{
-		DHUDMessage *next = msg->Next;
-		msg->Draw (bottom, visibility);
+		DHUDMessageBase *next = msg->Next;
+		msg->CallDraw (bottom, visibility);
 		msg = next;
 	}
 }
@@ -1307,10 +1340,10 @@ void DBaseStatusBar::ScreenSizeChanged ()
 
 	for (size_t i = 0; i < countof(Messages); ++i)
 	{
-		DHUDMessage *message = Messages[i];
+		DHUDMessageBase *message = Messages[i];
 		while (message != NULL)
 		{
-			message->ScreenSizeChanged ();
+			message->CallScreenSizeChanged ();
 			message = message->Next;
 		}
 	}
diff --git a/src/gameconfigfile.cpp b/src/gameconfigfile.cpp
index 957a2d00cf..80e08b3e70 100644
--- a/src/gameconfigfile.cpp
+++ b/src/gameconfigfile.cpp
@@ -149,6 +149,7 @@ FGameConfigFile::FGameConfigFile ()
 		SetValueForKey ("Path", "$PROGDIR", true);
 #else
 		SetValueForKey ("Path", "$HOME/" GAME_DIR, true);
+		SetValueForKey ("Path", SHARE_DIR, true);
 		SetValueForKey ("Path", "/usr/local/share/doom", true);
 		SetValueForKey ("Path", "/usr/local/share/games/doom", true);
 		SetValueForKey ("Path", "/usr/share/doom", true);
diff --git a/src/gl/compatibility/gl_20.cpp b/src/gl/compatibility/gl_20.cpp
index 3321f95613..e5f097228e 100644
--- a/src/gl/compatibility/gl_20.cpp
+++ b/src/gl/compatibility/gl_20.cpp
@@ -209,9 +209,10 @@ static bool currentModelMatrixState;
 
 void FRenderState::ApplyFixedFunction()
 {
-	if (mTextureMode != ffTextureMode)
+	int thistm = mTextureMode == TM_MODULATE && mTempTM == TM_OPAQUE ? TM_OPAQUE : mTextureMode;
+	if (thistm != ffTextureMode)
 	{
-		ffTextureMode = mTextureMode;
+		ffTextureMode = thistm;
 		if (ffTextureMode == TM_CLAMPY) ffTextureMode = TM_MODULATE;	// this cannot be replicated. Too bad if it creates visual artifacts
 		gl_SetTextureMode(ffTextureMode);
 	}
diff --git a/src/gl/renderer/gl_2ddrawer.cpp b/src/gl/renderer/gl_2ddrawer.cpp
index 130b6931a6..cda4ea3742 100644
--- a/src/gl/renderer/gl_2ddrawer.cpp
+++ b/src/gl/renderer/gl_2ddrawer.cpp
@@ -405,7 +405,6 @@ void F2DDrawer::Draw()
 
 			gl_SetRenderStyle(dt->mRenderStyle, !dt->mMasked, false);
 			gl_RenderState.SetMaterial(dt->mTexture, CLAMP_XY_NOMIP, dt->mTranslation, -1, dt->mAlphaTexture);
-			if (dt->mTexture->tex->bHasCanvas) gl_RenderState.SetTextureMode(TM_OPAQUE);
 
 			glEnable(GL_SCISSOR_TEST);
 			glScissor(dt->mScissor[0], dt->mScissor[1], dt->mScissor[2], dt->mScissor[3]);
diff --git a/src/gl/renderer/gl_renderstate.cpp b/src/gl/renderer/gl_renderstate.cpp
index 119444af6e..81672b63cf 100644
--- a/src/gl/renderer/gl_renderstate.cpp
+++ b/src/gl/renderer/gl_renderstate.cpp
@@ -164,7 +164,7 @@ bool FRenderState::ApplyShader()
 	activeShader->muFogEnabled.Set(fogset);
 	activeShader->muPalLightLevels.Set(static_cast<int>(gl_bandedswlight) | (static_cast<int>(gl_fogmode) << 8));
 	activeShader->muGlobVis.Set(GLRenderer->mGlobVis / 32.0f);
-	activeShader->muTextureMode.Set(mTextureMode);
+	activeShader->muTextureMode.Set(mTextureMode == TM_MODULATE && mTempTM == TM_OPAQUE ? TM_OPAQUE : mTextureMode);
 	activeShader->muCameraPos.Set(mCameraPos.vec);
 	activeShader->muLightParms.Set(mLightParms);
 	activeShader->muFogColor.Set(mFogColor);
diff --git a/src/gl/renderer/gl_renderstate.h b/src/gl/renderer/gl_renderstate.h
index 92de96e9a6..6de2b1455d 100644
--- a/src/gl/renderer/gl_renderstate.h
+++ b/src/gl/renderer/gl_renderstate.h
@@ -112,6 +112,7 @@ class FRenderState
 
 	int mEffectState;
 	int mColormapState;
+	int mTempTM = TM_MODULATE;
 
 	float stAlphaThreshold;
 	int stSrcBlend, stDstBlend;
@@ -150,6 +151,14 @@ public:
 		{
 			if (mat->tex->UseBasePalette() || gl.legacyMode) translation = TRANSLATION(TRANSLATION_Standard, 8);
 		}
+		if (mat->tex->bHasCanvas)
+		{
+			mTempTM = TM_OPAQUE;
+		}
+		else
+		{
+			mTempTM = TM_MODULATE;
+		}
 		mEffectState = overrideshader >= 0? overrideshader : mat->mShaderIndex;
 		mShaderTimer = mat->tex->gl_info.shaderspeed;
 		mat->Bind(clampmode, translation);
diff --git a/src/gl/scene/gl_drawinfo.cpp b/src/gl/scene/gl_drawinfo.cpp
index 84da70596d..c2d79b3ca1 100644
--- a/src/gl/scene/gl_drawinfo.cpp
+++ b/src/gl/scene/gl_drawinfo.cpp
@@ -358,42 +358,46 @@ void GLDrawList::SortWallIntoPlane(SortNode * head,SortNode * sort)
 //
 //
 //==========================================================================
-void GLDrawList::SortSpriteIntoPlane(SortNode * head,SortNode * sort)
+void GLDrawList::SortSpriteIntoPlane(SortNode * head, SortNode * sort)
 {
-	GLFlat * fh=&flats[drawitems[head->itemindex].index];
-	GLSprite * ss=&sprites[drawitems[sort->itemindex].index];
+	GLFlat * fh = &flats[drawitems[head->itemindex].index];
+	GLSprite * ss = &sprites[drawitems[sort->itemindex].index];
 
 	bool ceiling = fh->z > r_viewpoint.Pos.Z;
 
-	if ((ss->z1>fh->z && ss->z2<fh->z) || ss->modelframe)
+	auto hiz = ss->z1 > ss->z2 ? ss->z1 : ss->z2;
+	auto loz = ss->z1 < ss->z2 ? ss->z1 : ss->z2;
+
+	if ((hiz > fh->z && loz < fh->z) || ss->modelframe)
 	{
 		// We have to split this sprite
-		GLSprite s=*ss;
+		GLSprite s = *ss;
 		AddSprite(&s);	// add a copy to avoid reallocation issues.
-	
-		// Splitting is done in the shader with clip planes, if available
+
+		// Splitting is done in the shader with clip planes, if available.
+		// The fallback here only really works for non-y-billboarded sprites.
 		if (gl.flags & RFL_NO_CLIP_PLANES)
 		{
 			GLSprite * ss1;
-			ss1=&sprites[sprites.Size()-1];
-			ss=&sprites[drawitems[sort->itemindex].index];	// may have been reallocated!
-			float newtexv=ss->vt + ((ss->vb-ss->vt)/(ss->z2-ss->z1))*(fh->z-ss->z1);
+			ss1 = &sprites[sprites.Size() - 1];
+			ss = &sprites[drawitems[sort->itemindex].index];	// may have been reallocated!
+			float newtexv = ss->vt + ((ss->vb - ss->vt) / (ss->z2 - ss->z1))*(fh->z - ss->z1);
 
 			if (!ceiling)
 			{
-				ss->z1=ss1->z2=fh->z;
-				ss->vt=ss1->vb=newtexv;
+				ss->z1 = ss1->z2 = fh->z;
+				ss->vt = ss1->vb = newtexv;
 			}
 			else
 			{
-				ss1->z1=ss->z2=fh->z;
-				ss1->vt=ss->vb=newtexv;
+				ss1->z1 = ss->z2 = fh->z;
+				ss1->vt = ss->vb = newtexv;
 			}
 		}
 
-		SortNode * sort2=SortNodes.GetNew();
-		memset(sort2,0,sizeof(SortNode));
-		sort2->itemindex=drawitems.Size()-1;
+		SortNode * sort2 = SortNodes.GetNew();
+		memset(sort2, 0, sizeof(SortNode));
+		sort2->itemindex = drawitems.Size() - 1;
 
 		head->AddToLeft(sort);
 		head->AddToRight(sort2);
@@ -406,7 +410,6 @@ void GLDrawList::SortSpriteIntoPlane(SortNode * head,SortNode * sort)
 	{
 		head->AddToRight(sort);
 	}
-
 }
 
 
diff --git a/src/gl/scene/gl_sprite.cpp b/src/gl/scene/gl_sprite.cpp
index cfaa34f6ff..74e5b8ed98 100644
--- a/src/gl/scene/gl_sprite.cpp
+++ b/src/gl/scene/gl_sprite.cpp
@@ -1211,7 +1211,7 @@ void GLSprite::ProcessParticle (particle_t *particle, sector_t *sector)//, int s
 	}
 
 	double timefrac = r_viewpoint.TicFrac;
-	if (paused || bglobal.freeze)
+	if (paused || bglobal.freeze || (level.flags2 & LEVEL2_FROZEN))
 		timefrac = 0.;
 	float xvf = (particle->Vel.X) * timefrac;
 	float yvf = (particle->Vel.Y) * timefrac;
diff --git a/src/gl/scene/gl_walls.cpp b/src/gl/scene/gl_walls.cpp
index 470cd97768..5db32de049 100644
--- a/src/gl/scene/gl_walls.cpp
+++ b/src/gl/scene/gl_walls.cpp
@@ -1060,8 +1060,8 @@ void GLWall::DoMidTexture(seg_t * seg, bool drawfogboundary,
 				// Draw the stuff
 				//
 				//
-				if (realfront->e->XFloor.lightlist.Size()==0 || mDrawer->FixedColormap) split.PutWall(translucent);
-				else split.SplitWall(realfront, translucent);
+				if (front->e->XFloor.lightlist.Size()==0 || mDrawer->FixedColormap) split.PutWall(translucent);
+				else split.SplitWall(front, translucent);
 
 				t=1;
 			}
@@ -1074,8 +1074,8 @@ void GLWall::DoMidTexture(seg_t * seg, bool drawfogboundary,
 			// Draw the stuff without splitting
 			//
 			//
-			if (realfront->e->XFloor.lightlist.Size()==0 || mDrawer->FixedColormap) PutWall(translucent);
-			else SplitWall(realfront, translucent);
+			if (front->e->XFloor.lightlist.Size()==0 || mDrawer->FixedColormap) PutWall(translucent);
+			else SplitWall(front, translucent);
 		}
 		alpha=1.0f;
 	}
@@ -1437,7 +1437,7 @@ void GLWall::Process(seg_t *seg, sector_t * frontsector, sector_t * backsector)
 	sector_t * segback;
 
 #ifdef _DEBUG
-	if (seg->linedef->Index() == 1)
+	if (seg->linedef->Index() == 10)
 	{
 		int a = 0;
 	}
diff --git a/src/info.h b/src/info.h
index 3e497d0f63..69912534fa 100644
--- a/src/info.h
+++ b/src/info.h
@@ -244,6 +244,7 @@ struct FActorInfo
 	PClassActor *Replacee = nullptr;
 	FState *OwnedStates = nullptr;
 	int NumOwnedStates = 0;
+	bool SkipSuperSet = false;
 	uint8_t GameFilter = GAME_Any;
 	uint16_t SpawnID = 0;
 	uint16_t ConversationID = 0;
@@ -287,7 +288,7 @@ struct FActorInfo
 };
 
 // This is now merely a wrapper that adds actor-specific functionality to PClass.
-// No objects of this type will be created ever - its only use is to static_casr
+// No objects of this type will be created ever - its only use is to static_cast
 // PClass to it.
 class PClassActor : public PClass
 {
@@ -343,7 +344,7 @@ public:
 	bool OwnsState(const FState *state)
 	{
 		auto i = ActorInfo();
-		return state >= i->OwnedStates && state < i->OwnedStates + i->NumOwnedStates;
+		return i != nullptr && state >= i->OwnedStates && state < i->OwnedStates + i->NumOwnedStates;
 	}
 
 	PClassActor *GetReplacement(bool lookskill=true);
diff --git a/src/namedef.h b/src/namedef.h
index ace456a691..9e6d3811a6 100644
--- a/src/namedef.h
+++ b/src/namedef.h
@@ -377,6 +377,8 @@ xx(MomZ)
 xx(Threshold)
 xx(DefThreshold)
 xx(Abs)
+xx(TeleportSpecial)
+xx(Teleport)
 xx(ACS_NamedExecuteWithResult)
 xx(CallACS)
 xx(Sqrt)
diff --git a/src/nodebuild.cpp b/src/nodebuild.cpp
index d4794c639f..5b849687c6 100644
--- a/src/nodebuild.cpp
+++ b/src/nodebuild.cpp
@@ -814,8 +814,8 @@ void FNodeBuilder::SplitSegs (uint32_t set, node_t &node, uint32_t splitseg, uin
 			frac = InterceptVector (node, *seg);
 			newvert.x = Vertices[seg->v1].x;
 			newvert.y = Vertices[seg->v1].y;
-			newvert.x += fixed_t(frac * double(Vertices[seg->v2].x - newvert.x));
-			newvert.y += fixed_t(frac * double(Vertices[seg->v2].y - newvert.y));
+			newvert.x += fixed_t(frac * (double(Vertices[seg->v2].x) - newvert.x));
+			newvert.y += fixed_t(frac * (double(Vertices[seg->v2].y) - newvert.y));
 			vertnum = VertexMap->SelectVertexClose (newvert);
 
 			if (vertnum != (unsigned int)seg->v1 && vertnum != (unsigned int)seg->v2)
diff --git a/src/nodebuild.h b/src/nodebuild.h
index f66e64aa4d..fd943cbbd0 100644
--- a/src/nodebuild.h
+++ b/src/nodebuild.h
@@ -91,6 +91,8 @@ struct FSimpleVert
 	fixed_t x, y;
 };
 
+typedef int64_t fixed64_t;
+
 class FNodeBuilder
 {
 	struct FPrivSeg
@@ -167,14 +169,14 @@ class FNodeBuilder
 		FNodeBuilder &MyBuilder;
 		TArray<int> *VertexGrid;
 
-		fixed_t MinX, MinY, MaxX, MaxY;
+		fixed64_t MinX, MinY, MaxX, MaxY;
 		int BlocksWide, BlocksTall;
 
 		enum { BLOCK_SHIFT = 8 + FRACBITS };
 		enum { BLOCK_SIZE = 1 << BLOCK_SHIFT };
 
 		int InsertVertex (FPrivVert &vert);
-		inline int GetBlock (fixed_t x, fixed_t y)
+		inline int GetBlock (fixed64_t x, fixed64_t y)
 		{
 			assert (x >= MinX);
 			assert (y >= MinY);
diff --git a/src/nodebuild_utility.cpp b/src/nodebuild_utility.cpp
index 754e3519c8..9dd3c7786f 100644
--- a/src/nodebuild_utility.cpp
+++ b/src/nodebuild_utility.cpp
@@ -641,8 +641,8 @@ FNodeBuilder::FVertexMap::FVertexMap (FNodeBuilder &builder,
 	MinY = miny;
 	BlocksWide = int(((double(maxx) - minx + 1) + (BLOCK_SIZE - 1)) / BLOCK_SIZE);
 	BlocksTall = int(((double(maxy) - miny + 1) + (BLOCK_SIZE - 1)) / BLOCK_SIZE);
-	MaxX = MinX + BlocksWide * BLOCK_SIZE - 1;
-	MaxY = MinY + BlocksTall * BLOCK_SIZE - 1;
+	MaxX = MinX + fixed64_t(BlocksWide) * BLOCK_SIZE - 1;
+	MaxY = MinY + fixed64_t(BlocksTall) * BLOCK_SIZE - 1;
 	VertexGrid = new TArray<int>[BlocksWide * BlocksTall];
 }
 
@@ -703,10 +703,10 @@ int FNodeBuilder::FVertexMap::InsertVertex (FNodeBuilder::FPrivVert &vert)
 	// If a vertex is near a block boundary, then it will be inserted on
 	// both sides of the boundary so that SelectVertexClose can find
 	// it by checking in only one block.
-	fixed_t minx = MAX (MinX, vert.x - VERTEX_EPSILON);
-	fixed_t maxx = MIN (MaxX, vert.x + VERTEX_EPSILON);
-	fixed_t miny = MAX (MinY, vert.y - VERTEX_EPSILON);
-	fixed_t maxy = MIN (MaxY, vert.y + VERTEX_EPSILON);
+	fixed64_t minx = MAX (MinX, fixed64_t(vert.x) - VERTEX_EPSILON);
+	fixed64_t maxx = MIN (MaxX, fixed64_t(vert.x) + VERTEX_EPSILON);
+	fixed64_t miny = MAX (MinY, fixed64_t(vert.y) - VERTEX_EPSILON);
+	fixed64_t maxy = MIN (MaxY, fixed64_t(vert.y) + VERTEX_EPSILON);
 
 	int blk[4] =
 	{
diff --git a/src/p_map.cpp b/src/p_map.cpp
index 7d5a79de88..16d8ac564b 100644
--- a/src/p_map.cpp
+++ b/src/p_map.cpp
@@ -898,7 +898,9 @@ bool PIT_CheckLine(FMultiBlockLinesIterator &mit, FMultiBlockLinesIterator::Chec
 		}
 
 		// check if the actor can step through the ceiling portal. In this case one-sided lines in the current area should not block
-		if (!cres.line->frontsector->PortalBlocksMovement(sector_t::ceiling))
+		// Use the same rules for stepping through a portal as for non-portal case.
+		bool ismissile = (tm.thing->flags & MF_MISSILE) && !(tm.thing->flags6 & MF6_STEPMISSILE) && !(tm.thing->flags3 & MF3_FLOORHUGGER);
+		if (!ismissile && !cres.line->frontsector->PortalBlocksMovement(sector_t::ceiling))
 		{
 			double portz = cres.line->frontsector->GetPortalPlaneZ(sector_t::ceiling);
 			if (tm.thing->Z() < portz && tm.thing->Z() + tm.thing->MaxStepHeight >= portz && tm.floorz < portz)
@@ -1008,7 +1010,9 @@ bool PIT_CheckLine(FMultiBlockLinesIterator &mit, FMultiBlockLinesIterator::Chec
 	FLineOpening open;
 
 	P_LineOpening(open, tm.thing, ld, ref, &cres.Position, cres.portalflags);
-	if (!tm.thing->Sector->PortalBlocksMovement(sector_t::ceiling))
+	// Use the same rules for stepping through a portal as for non-portal case.
+	bool ismissile = (tm.thing->flags & MF_MISSILE) && !(tm.thing->flags6 & MF6_STEPMISSILE) && !(tm.thing->flags3 & MF3_FLOORHUGGER);
+	if (!ismissile && !tm.thing->Sector->PortalBlocksMovement(sector_t::ceiling))
 	{
 		sector_t *oppsec = cres.line->frontsector == tm.thing->Sector ? cres.line->backsector : cres.line->frontsector;
 		if (oppsec->PortalBlocksMovement(sector_t::ceiling))
@@ -2707,8 +2711,8 @@ bool P_TryMove(AActor *thing, const DVector2 &pos,
 		FLinkContext ctx;
 		DVector3 oldpos = thing->Pos();
 		thing->UnlinkFromWorld(&ctx);
-		thing->SetXYZ(thing->PosRelative(thing->Sector->GetOppositePortalGroup(sector_t::ceiling)));
-		thing->Prev = thing->Pos() - oldpos;
+		thing->SetXYZ(thing->PosRelative(tm.portalgroup));
+		thing->Prev += thing->Pos() - oldpos;
 		thing->Sector = P_PointInSector(thing->Pos());
 		thing->PrevPortalGroup = thing->Sector->PortalGroup;
 		thing->LinkToWorld(&ctx);
diff --git a/src/p_mobj.cpp b/src/p_mobj.cpp
index 8e5e1d3a26..371e3f9773 100644
--- a/src/p_mobj.cpp
+++ b/src/p_mobj.cpp
@@ -8127,6 +8127,20 @@ DEFINE_ACTION_FUNCTION(AActor, absangle)	// should this be global?
 	ACTION_RETURN_FLOAT(absangle(DAngle(a1), DAngle(a2)).Degrees);
 }
 
+DEFINE_ACTION_FUNCTION(AActor, Distance2DSquared)
+{
+	PARAM_SELF_PROLOGUE(AActor);
+	PARAM_OBJECT_NOT_NULL(other, AActor);
+	ACTION_RETURN_FLOAT(self->Distance2DSquared(other));
+}
+
+DEFINE_ACTION_FUNCTION(AActor, Distance3DSquared)
+{
+	PARAM_SELF_PROLOGUE(AActor);
+	PARAM_OBJECT_NOT_NULL(other, AActor);
+	ACTION_RETURN_FLOAT(self->Distance3DSquared(other));
+}
+
 DEFINE_ACTION_FUNCTION(AActor, Distance2D)
 {
 	PARAM_SELF_PROLOGUE(AActor);
diff --git a/src/polyrenderer/scene/poly_particle.cpp b/src/polyrenderer/scene/poly_particle.cpp
index 0ab3beb229..942ef13464 100644
--- a/src/polyrenderer/scene/poly_particle.cpp
+++ b/src/polyrenderer/scene/poly_particle.cpp
@@ -35,7 +35,7 @@ EXTERN_CVAR(Int, gl_particles_style)
 void RenderPolyParticle::Render(PolyRenderThread *thread, const TriMatrix &worldToClip, const PolyClipPlane &clipPlane, particle_t *particle, subsector_t *sub, uint32_t stencilValue)
 {
 	double timefrac = r_viewpoint.TicFrac;
-	if (paused || bglobal.freeze)
+	if (paused || bglobal.freeze || (level.flags2 & LEVEL2_FROZEN))
 		timefrac = 0.;
 	DVector3 pos = particle->Pos + (particle->Vel * timefrac);
 	double psize = particle->size / 8.0;
diff --git a/src/r_data/models/models.cpp b/src/r_data/models/models.cpp
index ff799b14dd..3198afd7f6 100644
--- a/src/r_data/models/models.cpp
+++ b/src/r_data/models/models.cpp
@@ -125,9 +125,17 @@ void FModelRenderer::RenderModel(float x, float y, float z, FSpriteModelFrame *s
 
 	// Applying model transformations:
 	// 1) Applying actor angle, pitch and roll to the model
+	if (smf->flags & MDL_USEROTATIONCENTER)
+	{
+		objectToWorldMatrix.translate(smf->rotationCenterX, smf->rotationCenterZ, smf->rotationCenterY);
+	}
 	objectToWorldMatrix.rotate(-angle, 0, 1, 0);
 	objectToWorldMatrix.rotate(pitch, 0, 0, 1);
 	objectToWorldMatrix.rotate(-roll, 1, 0, 0);
+	if (smf->flags & MDL_USEROTATIONCENTER)
+	{
+		objectToWorldMatrix.translate(-smf->rotationCenterX, -smf->rotationCenterZ, -smf->rotationCenterY);
+	}
 
 	// 2) Applying Doomsday like rotation of the weapon pickup models
 	// The rotation angle is based on the elapsed time.
@@ -789,6 +797,13 @@ void gl_InitModels()
 					{
 						smf.flags |= MDL_DONTCULLBACKFACES;
 					}
+					else if (sc.Compare("userotationcenter"))
+					{
+						smf.flags |= MDL_USEROTATIONCENTER;
+						smf.rotationCenterX = 0.;
+						smf.rotationCenterY = 0.;
+						smf.rotationCenterZ = 0.;
+					}
 					else
 					{
 						sc.ScriptMessage("Unrecognized string \"%s\"", sc.String);
diff --git a/src/r_data/models/models.h b/src/r_data/models/models.h
index 4a8678fa6f..e6786a7210 100644
--- a/src/r_data/models/models.h
+++ b/src/r_data/models/models.h
@@ -447,6 +447,7 @@ enum
 	MDL_USEACTORROLL				= 64,
 	MDL_BADROTATION					= 128,
 	MDL_DONTCULLBACKFACES			= 256,
+	MDL_USEROTATIONCENTER			= 512,
 };
 
 struct FSpriteModelFrame
diff --git a/src/s_environment.cpp b/src/s_environment.cpp
index ac268bc5fc..0618d72e35 100644
--- a/src/s_environment.cpp
+++ b/src/s_environment.cpp
@@ -677,7 +677,7 @@ void S_UnloadReverbDef ()
 	Environments = &Off;
 }
 
-CUSTOM_CVAR(Bool, eaxedit_test, true, CVAR_ARCHIVE | CVAR_GLOBALCONFIG | CVAR_NOINITCALL)
+CUSTOM_CVAR(Bool, eaxedit_test, false, CVAR_NOINITCALL)
 {
 	if (self)
 	{
diff --git a/src/scripting/backend/codegen.cpp b/src/scripting/backend/codegen.cpp
index 96393ad4c1..273d4e4987 100644
--- a/src/scripting/backend/codegen.cpp
+++ b/src/scripting/backend/codegen.cpp
@@ -2304,6 +2304,7 @@ ExpEmit FxPreIncrDecr::Emit(VMFunctionBuilder *build)
 	}
 
 	pointer.Free(build);
+	value.Target = false;	// This is for 'unrequesting' the address of a register variable. If not done here, passing a preincrement expression to a function will generate bad code.
 	return value;
 }
 
@@ -7406,7 +7407,16 @@ ExpEmit FxArrayElement::Emit(VMFunctionBuilder *build)
 	
 	if (arrayispointer)
 	{
-		arraytype = static_cast<PArray*>(Array->ValueType->toPointer()->PointedType);
+		auto ptr = Array->ValueType->toPointer();
+		if (ptr != nullptr)
+		{
+			arraytype = static_cast<PArray*>(ptr->PointedType);
+		}
+		else
+		{
+			ScriptPosition.Message(MSG_ERROR, "Internal error when generating code for array access");
+			return ExpEmit();
+		}
 	}
 	else
 	{
@@ -7758,6 +7768,8 @@ FxExpression *FxFunctionCall::Resolve(FCompileContext& ctx)
 	}
 	else
 	{
+		// This alias is needed because Actor has a Teleport function.
+		if (MethodName == NAME_TeleportSpecial) MethodName = NAME_Teleport;
 		special = P_FindLineSpecial(MethodName.GetChars(), &min, &max);
 	}
 	if (special != 0 && min >= 0)
diff --git a/src/scripting/thingdef_properties.cpp b/src/scripting/thingdef_properties.cpp
index c36058ca46..03ad9c1ccb 100644
--- a/src/scripting/thingdef_properties.cpp
+++ b/src/scripting/thingdef_properties.cpp
@@ -540,7 +540,7 @@ DEFINE_PROPERTY(skip_super, 0, Actor)
 	if (info->Size != actorclass->Size)
 	{
 		bag.ScriptPosition.Message(MSG_OPTERROR,
-			"'skip_super' is only allowed in subclasses of AActor with no additional fields and will be ignored in type %s.", info->TypeName.GetChars());
+			"'skip_super' is only allowed in subclasses of Actor with no additional fields and will be ignored in type %s.", info->TypeName.GetChars());
 		return;
 	}
 	if (bag.StateSet)
@@ -552,6 +552,7 @@ DEFINE_PROPERTY(skip_super, 0, Actor)
 
 	*defaults = *GetDefault<AActor>();
 	ResetBaggage (&bag, RUNTIME_CLASS(AActor));
+	static_cast<PClassActor*>(bag.Info)->ActorInfo()->SkipSuperSet = true;	// ZScript processes the states later so this property must be flagged for later handling.
 }
 
 //==========================================================================
diff --git a/src/scripting/types.cpp b/src/scripting/types.cpp
index 5059834d48..d683e62d6f 100644
--- a/src/scripting/types.cpp
+++ b/src/scripting/types.cpp
@@ -1968,7 +1968,10 @@ void PDynArray::SetPointerArray(void *base, unsigned offset, TArray<size_t> *spe
 void PDynArray::WriteValue(FSerializer &ar, const char *key, const void *addr) const
 {
 	FArray *aray = (FArray*)addr;
-	if (aray->Count > 0)
+	// We may skip an empty array only if it gets stored under a named key.
+	// If no name is given, i.e. it's part of an outer array's element list, even empty arrays must be stored,
+	// because otherwise the array would lose its entry.
+	if (aray->Count > 0 || key == nullptr)	
 	{
 		if (ar.BeginArray(key))
 		{
diff --git a/src/scripting/zscript/zcc_compile.cpp b/src/scripting/zscript/zcc_compile.cpp
index ab8bef5f0c..e4773f1c68 100644
--- a/src/scripting/zscript/zcc_compile.cpp
+++ b/src/scripting/zscript/zcc_compile.cpp
@@ -2872,7 +2872,18 @@ void ZCCCompiler::CompileStates()
 
 		FString statename;	// The state builder wants the label as one complete string, not separated into tokens.
 		FStateDefinitions statedef;
-		statedef.MakeStateDefines(ValidateActor(c->ClassType()->ParentClass));
+
+		if (static_cast<PClassActor*>(c->ClassType())->ActorInfo()->SkipSuperSet)
+		{
+			// SKIP_SUPER'ed actors only get the base states from AActor.
+			statedef.MakeStateDefines(RUNTIME_CLASS(AActor));
+		}
+		else
+		{
+			statedef.MakeStateDefines(ValidateActor(c->ClassType()->ParentClass));
+		}
+
+
 		int numframes = 0;
 
 		for (auto s : c->States)
diff --git a/src/sound/musicformats/music_midistream.cpp b/src/sound/musicformats/music_midistream.cpp
index db610e23ff..5889b0e1da 100644
--- a/src/sound/musicformats/music_midistream.cpp
+++ b/src/sound/musicformats/music_midistream.cpp
@@ -190,32 +190,32 @@ MIDIDevice *MIDIStreamer::CreateMIDIDevice(EMidiDevice devtype)
 	{
 		try
 		{
-			switch (devtype)
-			{
+	switch (devtype)
+	{
 			case MDEV_GUS:
 				return new TimidityMIDIDevice(Args);
 
-			case MDEV_MMAPI:
+	case MDEV_MMAPI:
 #ifdef _WIN32
-				return CreateWinMIDIDevice(mididevice);
+		return CreateWinMIDIDevice(mididevice);
 #endif
-				// Intentional fall-through for non-Windows systems.
+		// Intentional fall-through for non-Windows systems.
 
-			case MDEV_FLUIDSYNTH:
-				return new FluidSynthMIDIDevice(Args);
+	case MDEV_FLUIDSYNTH:
+		return new FluidSynthMIDIDevice(Args);
 
-			case MDEV_OPL:
-				return new OPLMIDIDevice(Args);
+	case MDEV_OPL:
+			return new OPLMIDIDevice(Args);
 
-			case MDEV_TIMIDITY:
-				return CreateTimidityPPMIDIDevice(Args);
+	case MDEV_TIMIDITY:
+		return CreateTimidityPPMIDIDevice(Args);
 
-			case MDEV_WILDMIDI:
-				return new WildMIDIDevice(Args);
+	case MDEV_WILDMIDI:
+		return new WildMIDIDevice(Args);
 
-			default:
+	default:
 				break;
-			}
+	}
 		}
 		catch (CRecoverableError &err)
 		{
@@ -721,6 +721,14 @@ int MIDIStreamer::FillBuffer(int buffer_num, int max_events, uint32_t max_time)
 	if (InitialPlayback)
 	{
 		InitialPlayback = false;
+		// Send the GS System Reset SysEx message.
+		events[0] = 0;								// dwDeltaTime
+		events[1] = 0;								// dwStreamID
+		events[2] = (MEVENT_LONGMSG << 24) | 6;		// dwEvent
+		events[3] = MAKE_ID(0xf0, 0x7e, 0x7f, 0x09);	// dwParms[0]
+		events[4] = MAKE_ID(0x01, 0xf7, 0x00, 0x00);	// dwParms[1]
+		events += 5;
+
 		// Send the full master volume SysEx message.
 		events[0] = 0;								// dwDeltaTime
 		events[1] = 0;								// dwStreamID
diff --git a/src/swrenderer/things/r_particle.cpp b/src/swrenderer/things/r_particle.cpp
index 7c2d88f481..ee791b56b3 100644
--- a/src/swrenderer/things/r_particle.cpp
+++ b/src/swrenderer/things/r_particle.cpp
@@ -79,7 +79,7 @@ namespace swrenderer
 		sector_t*			heightsec = NULL;
 
 		double timefrac = r_viewpoint.TicFrac;
-		if (paused || bglobal.freeze)
+		if (paused || bglobal.freeze || (level.flags2 & LEVEL2_FROZEN))
 			timefrac = 0.;
 
 		double ippx = particle->Pos.X + particle->Vel.X * timefrac;
diff --git a/src/v_text.cpp b/src/v_text.cpp
index f4829ec183..06b09a2ef8 100644
--- a/src/v_text.cpp
+++ b/src/v_text.cpp
@@ -35,6 +35,7 @@
 #include <stdlib.h>
 #include <stdarg.h>
 #include <ctype.h>
+#include <wctype.h>
 
 #include "v_text.h"
 
@@ -387,7 +388,7 @@ FBrokenLines *V_BreakLines (FFont *font, int maxwidth, const uint8_t *string, bo
 			continue;
 		}
 
-		if (isspace(c)) 
+		if (iswspace(c)) 
 		{
 			if (!lastWasSpace)
 			{
@@ -420,12 +421,12 @@ FBrokenLines *V_BreakLines (FFont *font, int maxwidth, const uint8_t *string, bo
 			start = space;
 			space = NULL;
 
-			while (*start && isspace (*start) && *start != '\n')
+			while (*start && iswspace (*start) && *start != '\n')
 				start++;
 			if (*start == '\n')
 				start++;
 			else
-				while (*start && isspace (*start))
+				while (*start && iswspace (*start))
 					start++;
 			string = start;
 		}
@@ -443,7 +444,7 @@ FBrokenLines *V_BreakLines (FFont *font, int maxwidth, const uint8_t *string, bo
 		while (s < string)
 		{
 			// If there is any non-white space in the remainder of the string, add it.
-			if (!isspace (*s++))
+			if (!iswspace (*s++))
 			{
 				auto i = Lines.Reserve(1);
 				breakit (&Lines[i], font, start, string, linecolor);
diff --git a/wadsrc/static/compatibility.txt b/wadsrc/static/compatibility.txt
index b78b4e6648..6730028771 100644
--- a/wadsrc/static/compatibility.txt
+++ b/wadsrc/static/compatibility.txt
@@ -868,3 +868,17 @@ CA3773ED313E8899311F3DD0CA195A68 // e3m6
 {
 	shorttex
 }
+
+FCCA97FC851F6473EAA069F74247B317 // pg-raw.wad map31
+{
+	setlinesectorref 331 front 74
+	setlinesectorref 326 front 74
+	setlinesectorref 497 front 74
+	setlinesectorref 474 front 74
+	setlinesectorref 471 front 74
+	setlinesectorref 327 front 74
+	setlinesectorref 328 front 74
+	setlinesectorref 329 front 74
+	setsectortag 74 4
+	setlinespecial 357 Transfer_Heights 4 2 0 0 0 
+}
diff --git a/wadsrc/static/zscript/actor.txt b/wadsrc/static/zscript/actor.txt
index dbea3fd47c..cb2ceb9458 100644
--- a/wadsrc/static/zscript/actor.txt
+++ b/wadsrc/static/zscript/actor.txt
@@ -580,6 +580,8 @@ class Actor : Thinker native
 	native void SetDamage(int dmg);
 	native clearscope double Distance2D(Actor other) const;
 	native clearscope double Distance3D(Actor other) const;
+	native clearscope double Distance2DSquared(Actor other) const;
+	native clearscope double Distance3DSquared(Actor other) const;
 	native void SetOrigin(vector3 newpos, bool moving);
 	native void SetXYZ(vector3 newpos);
 	native Actor GetPointer(int aaptr);
@@ -1185,6 +1187,10 @@ class Actor : Thinker native
 	{
 		return ACS_ExecuteAlways(-int(script), mapnum, arg1, arg2, arg3);
 	}
+	int ACS_ScriptCall(name script, int arg1=0, int arg2=0, int arg3=0, int arg4=0)
+	{
+		return ACS_ExecuteWithResult(-int(script), arg1, arg2, arg3, arg4);
+	}
 	
 	States(Actor, Overlay, Weapon, Item)
 	{
diff --git a/wadsrc/static/zscript/doom/keen.txt b/wadsrc/static/zscript/doom/keen.txt
index 6d596c717a..083df92b48 100644
--- a/wadsrc/static/zscript/doom/keen.txt
+++ b/wadsrc/static/zscript/doom/keen.txt
@@ -70,8 +70,13 @@ extend class Actor
 		{
 			if (mo.health > 0 && mo != self)
 			{
-				// other Keen not dead
-				return;
+				// Added check for Dehacked and repurposed inventory items.
+				let inv = Inventory(mo);
+				if (inv == null || inv.Owner == null)
+				{
+					// other Keen not dead
+					return;
+				}
 			}
 		}
 		Door_Open(doortag, 16);
diff --git a/wadsrc/static/zscript/hexen/korax.txt b/wadsrc/static/zscript/hexen/korax.txt
index 8f313bc19e..b94664bea9 100644
--- a/wadsrc/static/zscript/hexen/korax.txt
+++ b/wadsrc/static/zscript/hexen/korax.txt
@@ -244,6 +244,11 @@ class Korax : Actor
 
 	void A_KoraxMissile()
 	{
+		if (!target)
+		{
+			return;
+		}
+
 		static const class<Actor> choices[] =
 		{
 			"WraithFX1", "Demon1FX1", "Demon2FX1", "FireDemonMissile", "CentaurFX", "SerpentFX"
@@ -282,6 +287,11 @@ class Korax : Actor
 
 	void KoraxFire (Class<Actor> type, int arm)
 	{
+		if (!target)
+		{
+			return;
+		}
+
 		static const int extension[] =
 		{
 			KORAX_ARM_EXTENSION_SHORT,
diff --git a/wadsrc/static/zscript/inventory/powerups.txt b/wadsrc/static/zscript/inventory/powerups.txt
index 6fb35b067e..5ef03d4209 100644
--- a/wadsrc/static/zscript/inventory/powerups.txt
+++ b/wadsrc/static/zscript/inventory/powerups.txt
@@ -1931,22 +1931,6 @@ class PowerMorph : Powerup
 
 		int savedMorphTics = MorphedPlayer.morphTics;
 		MorphedPlayer.UndoPlayerMorph (MorphedPlayer, 0, !!(MorphedPlayer.MorphStyle & MRF_UNDOALWAYS));
-
-		// Abort if unmorph failed; in that case,
-		// set the usual retry timer and return.
-		if (MorphedPlayer != null && MorphedPlayer.morphTics)
-		{
-			// Transfer retry timeout
-			// to the powerup's timer.
-			EffectTics = MorphedPlayer.morphTics;
-			// Reload negative morph tics;
-			// use actual value; it may
-			// be in use for animation.
-			MorphedPlayer.morphTics = savedMorphTics;
-			// Try again some time later
-			return;
-		}
-		// Unmorph suceeded
 		MorphedPlayer = null;
 	}
 
diff --git a/wadsrc/static/zscript/shared/fastprojectile.txt b/wadsrc/static/zscript/shared/fastprojectile.txt
index 1bed8cba22..c861a3f8fa 100644
--- a/wadsrc/static/zscript/shared/fastprojectile.txt
+++ b/wadsrc/static/zscript/shared/fastprojectile.txt
@@ -66,7 +66,7 @@ class FastProjectile : Actor
 		int count = 8;
 		if (radius > 0)
 		{
-			while ( abs(Vel.X) > radius * count || abs(Vel.Y) > radius * count)
+			while ( abs(Vel.X) >= radius * count || abs(Vel.Y) >= radius * count || abs(Vel.Z) >= height * count)
 			{
 				// we need to take smaller steps.
 				count += count;
diff --git a/wadsrc/static/zscript/statusbar/statusbar.txt b/wadsrc/static/zscript/statusbar/statusbar.txt
index 56e831f97b..29f9d01b07 100644
--- a/wadsrc/static/zscript/statusbar/statusbar.txt
+++ b/wadsrc/static/zscript/statusbar/statusbar.txt
@@ -101,6 +101,12 @@ class InventoryBarState ui
 	
 }
 
+class HUDMessageBase native ui
+{
+	virtual native bool Tick();
+	virtual native void ScreenSizeChanged();
+	virtual native void Draw(int bottom, int visibility);
+}
 
 class BaseStatusBar native ui
 {
@@ -291,6 +297,10 @@ class BaseStatusBar native ui
 	
 	private HUDFont mSmallFont;
 	
+	native void AttachMessage(HUDMessageBase msg);
+	native HUDMessageBase DetachMessage(HUDMessageBase msg);
+	native HUDMessageBase DetachMessageID(uint msgid);
+	native void DetachAllMessages();
 	
 	native void SetSize(int height, int vwidth, int vheight, int hwidth = -1, int hheight = -1);
 	native Vector2 GetHUDScale();
diff --git a/wadsrc_lights/static/filter/doom.doom1/gldefs.txt b/wadsrc_lights/static/filter/doom.doom1/gldefs.txt
index d79ba52963..83c30369dd 100644
--- a/wadsrc_lights/static/filter/doom.doom1/gldefs.txt
+++ b/wadsrc_lights/static/filter/doom.doom1/gldefs.txt
@@ -559,6 +559,21 @@ object SoulSphere
     frame SOUL { light SOULSPHERE }
 }
 
+pulselight MEGASPHERE
+{
+    color 0.5 0.5 0.4
+    size 60
+    secondarySize 63
+    interval 2.0
+    offset 0 16 0
+	attenuate 1
+}
+
+object MegaSphere
+{
+    frame MEGA { light MEGASPHERE }
+}
+
 // Invulnerability Sphere
 pulselight INVULN
 {
diff --git a/wadsrc_lights/static/filter/doom.doom2/gldefs.txt b/wadsrc_lights/static/filter/doom.doom2/gldefs.txt
index d79ba52963..83c30369dd 100644
--- a/wadsrc_lights/static/filter/doom.doom2/gldefs.txt
+++ b/wadsrc_lights/static/filter/doom.doom2/gldefs.txt
@@ -559,6 +559,21 @@ object SoulSphere
     frame SOUL { light SOULSPHERE }
 }
 
+pulselight MEGASPHERE
+{
+    color 0.5 0.5 0.4
+    size 60
+    secondarySize 63
+    interval 2.0
+    offset 0 16 0
+	attenuate 1
+}
+
+object MegaSphere
+{
+    frame MEGA { light MEGASPHERE }
+}
+
 // Invulnerability Sphere
 pulselight INVULN
 {