diff --git a/src/c_dispatch.cpp b/src/c_dispatch.cpp
index 105d8c0d3..65e017bdc 100644
--- a/src/c_dispatch.cpp
+++ b/src/c_dispatch.cpp
@@ -723,7 +723,7 @@ void AddCommandString (char *cmd, int keynum)
 						  // Note that deferred commands lose track of which key
 						  // (if any) they were pressed from.
 							*brkpt = ';';
-							new DWaitingCommand (brkpt, tics+1);
+							new DWaitingCommand (brkpt, tics);
 						}
 						return;
 					}
diff --git a/src/compatibility.cpp b/src/compatibility.cpp
index 7339a0f19..351c2672a 100644
--- a/src/compatibility.cpp
+++ b/src/compatibility.cpp
@@ -81,6 +81,7 @@ enum
 	CP_SECTORFLOOROFFSET,
 	CP_SETWALLYSCALE,
 	CP_SETTHINGZ,
+	CP_SETTAG,
 };
 
 // EXTERNAL FUNCTION PROTOTYPES --------------------------------------------
@@ -307,6 +308,15 @@ void ParseCompatibility()
 				sc.MustGetFloat();
 				CompatParams.Push(FLOAT2FIXED(sc.Float));
 			}
+			else if (sc.Compare("setsectortag"))
+			{
+				if (flags.ExtCommandIndex == ~0u) flags.ExtCommandIndex = CompatParams.Size();
+				CompatParams.Push(CP_SETTAG);
+				sc.MustGetNumber();
+				CompatParams.Push(sc.Number);
+				sc.MustGetNumber();
+				CompatParams.Push(sc.Number);
+			}
 			else 
 			{
 				sc.UnGet();
@@ -520,6 +530,15 @@ void SetCompatibilityParams()
 					i += 3;
 					break;
 				}	
+				case CP_SETTAG:
+				{
+					if ((unsigned)CompatParams[i + 1] < (unsigned)numsectors)
+					{
+						sectors[CompatParams[i + 1]].tag = CompatParams[i + 2];
+					}
+					i += 3;
+					break;
+				}
 			}
 		}
 	}
diff --git a/src/g_doom/a_doomweaps.cpp b/src/g_doom/a_doomweaps.cpp
index 368d7ce8b..424e691e7 100644
--- a/src/g_doom/a_doomweaps.cpp
+++ b/src/g_doom/a_doomweaps.cpp
@@ -107,6 +107,8 @@ enum SAW_Flags
 	SF_RANDOMLIGHTHIT = 4,
 	SF_NOUSEAMMOMISS = 8,
 	SF_NOUSEAMMO = 16,
+	SF_NOPULLIN = 32,
+	SF_NOTURN = 64,
 };
 
 DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Saw)
@@ -187,23 +189,27 @@ DEFINE_ACTION_FUNCTION_PARAMS(AActor, A_Saw)
 	S_Sound (self, CHAN_WEAPON, hitsound, 1, ATTN_NORM);
 		
 	// turn to face target
-	angle = R_PointToAngle2 (self->x, self->y,
-							 linetarget->x, linetarget->y);
-	if (angle - self->angle > ANG180)
+	if (!(Flags & SF_NOTURN))
 	{
-		if (angle - self->angle < (angle_t)(-ANG90/20))
-			self->angle = angle + ANG90/21;
+			angle = R_PointToAngle2(self->x, self->y,
+			linetarget->x, linetarget->y);
+		if (angle - self->angle > ANG180)
+		{
+			if (angle - self->angle < (angle_t)(-ANG90 / 20))
+				self->angle = angle + ANG90 / 21;
+			else
+				self->angle -= ANG90 / 20;
+		}
 		else
-			self->angle -= ANG90/20;
+		{
+			if (angle - self->angle > ANG90 / 20)
+				self->angle = angle - ANG90 / 21;
+			else
+				self->angle += ANG90 / 20;
+		}
 	}
-	else
-	{
-		if (angle - self->angle > ANG90/20)
-			self->angle = angle - ANG90/21;
-		else
-			self->angle += ANG90/20;
-	}
-	self->flags |= MF_JUSTATTACKED;
+	if (!(Flags & SF_NOPULLIN))
+		self->flags |= MF_JUSTATTACKED;
 }
 
 //
diff --git a/src/g_level.h b/src/g_level.h
index 0cd366798..05290f48b 100644
--- a/src/g_level.h
+++ b/src/g_level.h
@@ -525,7 +525,7 @@ level_info_t *CheckLevelRedirect (level_info_t *info);
 
 FString CalcMapName (int episode, int level);
 
-void G_ParseMapInfo (const char *basemapinfo);
+void G_ParseMapInfo (FString basemapinfo);
 
 void G_ClearSnapshots (void);
 void P_RemoveDefereds ();
diff --git a/src/g_mapinfo.cpp b/src/g_mapinfo.cpp
index b7aa77e1c..5a451dfaa 100644
--- a/src/g_mapinfo.cpp
+++ b/src/g_mapinfo.cpp
@@ -1886,7 +1886,7 @@ static void ClearMapinfo()
 //
 //==========================================================================
 
-void G_ParseMapInfo (const char *basemapinfo)
+void G_ParseMapInfo (FString basemapinfo)
 {
 	int lump, lastlump = 0;
 	level_info_t gamedefaults;
@@ -1895,7 +1895,7 @@ void G_ParseMapInfo (const char *basemapinfo)
 	atterm(ClearMapinfo);
 
 	// Parse the default MAPINFO for the current game. This lump *MUST* come from zdoom.pk3.
-	if (basemapinfo != NULL)
+	if (basemapinfo.IsNotEmpty())
 	{
 		FMapInfoParser parse;
 		level_info_t defaultinfo;
@@ -1903,7 +1903,7 @@ void G_ParseMapInfo (const char *basemapinfo)
 		if (Wads.GetLumpFile(baselump) > 0)
 		{
 			I_FatalError("File %s is overriding core lump %s.", 
-				Wads.GetWadFullName(Wads.GetLumpFile(baselump)), basemapinfo);
+				Wads.GetWadFullName(Wads.GetLumpFile(baselump)), basemapinfo.GetChars());
 		}
 		parse.ParseMapInfo(baselump, gamedefaults, defaultinfo);
 	}
diff --git a/src/gl/data/gl_data.cpp b/src/gl/data/gl_data.cpp
index 47a08af83..52166f0a8 100644
--- a/src/gl/data/gl_data.cpp
+++ b/src/gl/data/gl_data.cpp
@@ -437,7 +437,6 @@ void gl_RecalcVertexHeights(vertex_t * v)
 	int i,j,k;
 	float height;
 
-	//@sync-vertexheights
 	v->numheights=0;
 	for(i=0;i<v->numsectors;i++)
 	{
diff --git a/src/gl/scene/gl_drawinfo.cpp b/src/gl/scene/gl_drawinfo.cpp
index 3f469d999..1e6bc1bfe 100644
--- a/src/gl/scene/gl_drawinfo.cpp
+++ b/src/gl/scene/gl_drawinfo.cpp
@@ -878,7 +878,6 @@ void GLDrawList::SortFlats()
 //==========================================================================
 void GLDrawList::AddWall(GLWall * wall)
 {
-	//@sync-drawinfo
 	drawitems.Push(GLDrawItem(GLDIT_WALL,walls.Push(*wall)));
 }
 
@@ -889,7 +888,6 @@ void GLDrawList::AddWall(GLWall * wall)
 //==========================================================================
 void GLDrawList::AddFlat(GLFlat * flat)
 {
-	//@sync-drawinfo
 	drawitems.Push(GLDrawItem(GLDIT_FLAT,flats.Push(*flat)));
 }
 
@@ -900,7 +898,6 @@ void GLDrawList::AddFlat(GLFlat * flat)
 //==========================================================================
 void GLDrawList::AddSprite(GLSprite * sprite)
 {	
-	//@sync-drawinfo
 	drawitems.Push(GLDrawItem(GLDIT_SPRITE,sprites.Push(*sprite)));
 }
 
diff --git a/src/gl/scene/gl_renderhacks.cpp b/src/gl/scene/gl_renderhacks.cpp
index 20d6ac7bc..a8ef49e25 100644
--- a/src/gl/scene/gl_renderhacks.cpp
+++ b/src/gl/scene/gl_renderhacks.cpp
@@ -162,7 +162,6 @@ void FDrawInfo::AddUpperMissingTexture(side_t * side, subsector_t *sub, fixed_t
 				return;
 			}
 
-			//@sync-hack
 			for(unsigned int i=0;i<MissingUpperTextures.Size();i++)
 			{
 				if (MissingUpperTextures[i].sub == sub)
@@ -229,13 +228,12 @@ void FDrawInfo::AddLowerMissingTexture(side_t * side, subsector_t *sub, fixed_t
 			}
 
 			// Ignore FF_FIX's because they are designed to abuse missing textures
-			if (seg->backsector->e->XFloor.ffloors.Size() && seg->backsector->e->XFloor.ffloors[0]->flags&FF_FIX)
+			if (seg->backsector->e->XFloor.ffloors.Size() && (seg->backsector->e->XFloor.ffloors[0]->flags&(FF_FIX|FF_SEETHROUGH)) == FF_FIX)
 			{
 				totalms.Unclock();
 				return;
 			}
 
-			//@sync-hack
 			for(unsigned int i=0;i<MissingLowerTextures.Size();i++)
 			{
 				if (MissingLowerTextures[i].sub == sub)
@@ -732,7 +730,6 @@ void FDrawInfo::AddHackedSubsector(subsector_t * sub)
 {
 	if (!(level.maptype == MAPTYPE_HEXEN))
 	{
-		//@sync-hack (probably not, this is only called from the main thread)
 		SubsectorHackInfo sh={sub, 0};
 		SubsectorHacks.Push (sh);
 	}
@@ -1032,13 +1029,11 @@ ADD_STAT(sectorhacks)
 
 void FDrawInfo::AddFloorStack(sector_t * sec)
 {
-	//@sync-hack
 	FloorStacks.Push(sec);
 }
 
 void FDrawInfo::AddCeilingStack(sector_t * sec)
 {
-	//@sync-hack
 	CeilingStacks.Push(sec);
 }
 
diff --git a/src/gl/scene/gl_walls.cpp b/src/gl/scene/gl_walls.cpp
index e86b03d49..94386c9a5 100644
--- a/src/gl/scene/gl_walls.cpp
+++ b/src/gl/scene/gl_walls.cpp
@@ -169,7 +169,6 @@ void GLWall::PutWall(bool translucent)
 	// portals don't go into the draw list.
 	// Instead they are added to the portal manager
 	case RENDERWALL_HORIZON:
-		//@sync-portal
 		horizon=UniqueHorizons.Get(horizon);
 		portal=GLPortal::FindPortal(horizon);
 		if (!portal) portal=new GLHorizonPortal(horizon);
@@ -177,14 +176,12 @@ void GLWall::PutWall(bool translucent)
 		break;
 
 	case RENDERWALL_SKYBOX:
-		//@sync-portal
 		portal=GLPortal::FindPortal(skybox);
 		if (!portal) portal=new GLSkyboxPortal(skybox);
 		portal->AddLine(this);
 		break;
 
 	case RENDERWALL_SECTORSTACK:
-		//@sync-portal
 		portal = this->portal->GetGLPortal();
 		portal->AddLine(this);
 		break;
@@ -201,7 +198,6 @@ void GLWall::PutWall(bool translucent)
 		break;
 
 	case RENDERWALL_MIRROR:
-		//@sync-portal
 		portal=GLPortal::FindPortal(seg->linedef);
 		if (!portal) portal=new GLMirrorPortal(seg->linedef);
 		portal->AddLine(this);
@@ -214,7 +210,6 @@ void GLWall::PutWall(bool translucent)
 		break;
 
 	case RENDERWALL_SKY:
-		//@sync-portal
 		portal=GLPortal::FindPortal(sky);
 		if (!portal) portal=new GLSkyPortal(sky);
 		portal->AddLine(this);
diff --git a/src/gl/textures/gl_material.cpp b/src/gl/textures/gl_material.cpp
index efbbec332..05fcb992b 100644
--- a/src/gl/textures/gl_material.cpp
+++ b/src/gl/textures/gl_material.cpp
@@ -772,7 +772,6 @@ FMaterial * FMaterial::ValidateTexture(FTexture * tex, bool expand)
 		FMaterial *gltex = tex->gl_info.Material[expand];
 		if (gltex == NULL) 
 		{
-			//@sync-tex
 			gltex = new FMaterial(tex, expand);
 		}
 		return gltex;
diff --git a/src/gl/textures/gl_texture.cpp b/src/gl/textures/gl_texture.cpp
index 5725f831c..b737ced77 100644
--- a/src/gl/textures/gl_texture.cpp
+++ b/src/gl/textures/gl_texture.cpp
@@ -569,7 +569,7 @@ bool FTexture::SmoothEdges(unsigned char * buffer,int w, int h)
 		l1+=4;
 		for(x=1;x<w-1;x++, l1+=4)
 		{
-			if (l1[MSB]==0 &&  !CHKPIX(-w) && !CHKPIX(-1) && !CHKPIX(1)) CHKPIX(w);
+			if (l1[MSB]==0 &&  !CHKPIX(-w) && !CHKPIX(-1) && !CHKPIX(1) && !CHKPIX(-w-1) && !CHKPIX(-w+1) && !CHKPIX(w-1) && !CHKPIX(w+1)) CHKPIX(w);
 		}
 		if (l1[MSB]==0 && !CHKPIX(-w) && !CHKPIX(-1)) CHKPIX(w);
 		l1+=4;
diff --git a/src/p_3dfloors.cpp b/src/p_3dfloors.cpp
index ce6224b53..67933a75a 100644
--- a/src/p_3dfloors.cpp
+++ b/src/p_3dfloors.cpp
@@ -264,6 +264,7 @@ static int P_Set3DFloor(line_t * line, int param, int param2, int alpha)
 		else if (param==4)
 		{
 			flags=FF_EXISTS|FF_RENDERPLANES|FF_INVERTPLANES|FF_NOSHADE|FF_FIX;
+			if (param2 & 1) flags |= FF_SEETHROUGH;	// marker for allowing missing texture checks
 			alpha=255;
 		}
 		else 
diff --git a/src/p_acs.cpp b/src/p_acs.cpp
index e0967d400..235a47933 100644
--- a/src/p_acs.cpp
+++ b/src/p_acs.cpp
@@ -3747,16 +3747,16 @@ void DLevelScript::DoSetActorProperty (AActor *actor, int property, int value)
 		break;
 
 	case APROP_Friendly:
+		if (actor->CountsAsKill()) level.total_monsters--;
 		if (value)
 		{
-			if (actor->CountsAsKill()) level.total_monsters--;
 			actor->flags |= MF_FRIENDLY;
 		}
 		else
 		{
 			actor->flags &= ~MF_FRIENDLY;
-			if (actor->CountsAsKill()) level.total_monsters++;
 		}
+		if (actor->CountsAsKill()) level.total_monsters++;
 		break;
 
 
diff --git a/src/sound/music_midistream.cpp b/src/sound/music_midistream.cpp
index ba0077903..15f4caec8 100644
--- a/src/sound/music_midistream.cpp
+++ b/src/sound/music_midistream.cpp
@@ -540,7 +540,7 @@ bool MIDIStreamer::IsPlaying()
 
 void MIDIStreamer::MusicVolumeChanged()
 {
-	if (MIDI->FakeVolume())
+	if (MIDI != NULL && MIDI->FakeVolume())
 	{
 		float realvolume = clamp<float>(snd_musicvolume * relative_volume, 0.f, 1.f);
 		Volume = clamp<DWORD>((DWORD)(realvolume * 65535.f), 0, 65535);
@@ -622,7 +622,7 @@ void MIDIStreamer::FluidSettingStr(const char *setting, const char *value)
 
 void MIDIStreamer::OutputVolume (DWORD volume)
 {
-	if (MIDI->FakeVolume())
+	if (MIDI != NULL && MIDI->FakeVolume())
 	{
 		NewVolume = volume;
 		VolumeChanged = true;
diff --git a/wadsrc/static/actors/constants.txt b/wadsrc/static/actors/constants.txt
index 0332d09a3..d5358e5af 100644
--- a/wadsrc/static/actors/constants.txt
+++ b/wadsrc/static/actors/constants.txt
@@ -14,6 +14,8 @@ const int SF_RANDOMLIGHTHIT = 4;
 const int SF_RANDOMLIGHTBOTH = 6;
 const int SF_NOUSEAMMOMISS = 8;
 const int SF_NOUSEAMMO = 16;
+const int SF_NOPULLIN = 32;
+const int SF_NOTURN = 64;
 
 // Flags for A_CustomMissile
 const int CMF_AIMOFFSET = 1;
diff --git a/wadsrc/static/actors/doom/revenant.txt b/wadsrc/static/actors/doom/revenant.txt
index 5f0a78691..5ef97789b 100644
--- a/wadsrc/static/actors/doom/revenant.txt
+++ b/wadsrc/static/actors/doom/revenant.txt
@@ -39,8 +39,8 @@ ACTOR Revenant 66
 		SKEL I 6 A_SkelFist
 		Goto See
 	Missile:
-		SKEL J 1 BRIGHT A_FaceTarget 
-		SKEL J 9 BRIGHT A_FaceTarget
+		SKEL J 0 BRIGHT A_FaceTarget 
+		SKEL J 10 BRIGHT A_FaceTarget
 		SKEL K 10 A_SkelMissile
 		SKEL K 10 A_FaceTarget
 		Goto See
diff --git a/wadsrc/static/compatibility.txt b/wadsrc/static/compatibility.txt
index 1c2307ec0..bf5f3cc3b 100644
--- a/wadsrc/static/compatibility.txt
+++ b/wadsrc/static/compatibility.txt
@@ -381,3 +381,17 @@ B9DFF13207EACAC675C71D82624D0007 // XtheaterIII map01
 {
 	DisablePushWindowCheck
 }
+
+712BB4CFBD0753178CA0C6814BE4C288 // map12 BTSX_E1 - patch some rendering glitches that are problematic to detect
+{
+	setsectortag 545 32000
+	setsectortag 1618 32000
+	setlinespecial 2853 Sector_Set3DFloor 32000 4 0 0 0
+	setsectortag 439 32001
+	setsectortag 458 32001
+	setlinespecial 2182 Sector_Set3DFloor 32001 4 0 0 0
+	setsectortag 454 32002
+	setsectortag 910 32002
+	setlinespecial 2410 Sector_Set3DFloor 32002 4 1 0 0
+}
+
diff --git a/wadsrc/static/iwadinfo.txt b/wadsrc/static/iwadinfo.txt
index a2f8ef6c0..088e74466 100644
--- a/wadsrc/static/iwadinfo.txt
+++ b/wadsrc/static/iwadinfo.txt
@@ -1,5 +1,23 @@
 // Must be sorted in identification order (easiest to recognize first!)
 
+IWad
+{
+	Name = "The Adventures of Square"
+	Game = "Doom"
+	Config = "Square"
+	MustContain = "SQU-IWAD", "E1A1"
+	BannerColors = "ff ff ff", "80 00 80"
+}
+
+IWad
+{
+	Name = "The Adventures of Square (Square-ware)"
+	Game = "Doom"
+	Config = "Square"
+	MustContain = "SQU-SWE1", "E1A1"
+	BannerColors = "ff ff ff", "80 00 80"
+}
+
 IWad
 {
 	Name = "Harmony"
@@ -361,4 +379,5 @@ Names
 	"harm1.wad"
 	"hacx.wad"
 	"hacx2.wad"
+	"square1.pk3"
 }