diff --git a/src/gl/data/gl_data.cpp b/src/gl/data/gl_data.cpp
index 07fac1b2e..d386428a2 100644
--- a/src/gl/data/gl_data.cpp
+++ b/src/gl/data/gl_data.cpp
@@ -483,7 +483,7 @@ FTextureID gl_GetSpriteFrame(unsigned sprite, int frame, int rot, angle_t ang, b
 
 //==========================================================================
 //
-// Recalculate all heights affectting this vertex.
+// Recalculate all heights affecting this vertex.
 //
 //==========================================================================
 void gl_RecalcVertexHeights(vertex_t * v)
diff --git a/src/gl/data/gl_setup.cpp b/src/gl/data/gl_setup.cpp
index 6bdf57d4c..7959b2083 100644
--- a/src/gl/data/gl_setup.cpp
+++ b/src/gl/data/gl_setup.cpp
@@ -623,20 +623,6 @@ void gl_CleanLevelData()
 		mo=next;
 	}
 
-	for(auto &v : level.vertexes) if (v.numsectors > 0)
-	{
-		if (v.sectors != nullptr)
-		{
-			delete [] v.sectors;
-			v.sectors = nullptr;
-		}
-		if (v.heightlist != nullptr)
-		{
-			delete [] v.heightlist;
-			v.heightlist = nullptr;
-		}
-	}
-
 	if (level.sides.Size() > 0 && level.sides[0].segs)
 	{
 		delete [] level.sides[0].segs;
diff --git a/src/gl/renderer/gl_renderer.cpp b/src/gl/renderer/gl_renderer.cpp
index 57d17dfb4..6021411be 100644
--- a/src/gl/renderer/gl_renderer.cpp
+++ b/src/gl/renderer/gl_renderer.cpp
@@ -164,7 +164,7 @@ void FGLRenderer::Initialize(int width, int height)
 	}
 	else mVAOID = 0;
 
-	gllight = FTexture::CreateTexture(Wads.GetNumForFullName("glstuff/gllight.png"), FTexture::TEX_MiscPatch);
+	if (gl.legacyMode) gllight = FTexture::CreateTexture(Wads.GetNumForFullName("glstuff/gllight.png"), FTexture::TEX_MiscPatch);
 	glpart2 = FTexture::CreateTexture(Wads.GetNumForFullName("glstuff/glpart2.png"), FTexture::TEX_MiscPatch);
 	glpart = FTexture::CreateTexture(Wads.GetNumForFullName("glstuff/glpart.png"), FTexture::TEX_MiscPatch);
 	mirrortexture = FTexture::CreateTexture(Wads.GetNumForFullName("glstuff/mirror.png"), FTexture::TEX_MiscPatch);
@@ -196,6 +196,7 @@ FGLRenderer::~FGLRenderer()
 	if (mLights != NULL) delete mLights;
 	if (glpart2) delete glpart2;
 	if (glpart) delete glpart;
+	if (gllight) delete gllight;
 	if (mirrortexture) delete mirrortexture;
 	if (mFBID != 0) glDeleteFramebuffers(1, &mFBID);
 	if (mVAOID != 0)
diff --git a/src/gl/textures/gl_texture.cpp b/src/gl/textures/gl_texture.cpp
index 8aaa98ae6..2b338513a 100644
--- a/src/gl/textures/gl_texture.cpp
+++ b/src/gl/textures/gl_texture.cpp
@@ -394,16 +394,20 @@ bool FTexture::FindHoles(const unsigned char * buffer, int w, int h)
 	}
 	if (startdraw==0 && lendraw==h) return false;	// nothing saved so don't create a split list
 
-	FloatRect * rcs = new FloatRect[gapc];
-
-	for(x=0;x<gapc;x++)
+	if (gapc > 0)
 	{
-		// gaps are stored as texture (u/v) coordinates
-		rcs[x].width=rcs[x].left=-1.0f;
-		rcs[x].top=(float)gaps[x][0]/(float)h;
-		rcs[x].height=(float)gaps[x][1]/(float)h;
+		FloatRect * rcs = new FloatRect[gapc];
+
+		for (x = 0; x < gapc; x++)
+		{
+			// gaps are stored as texture (u/v) coordinates
+			rcs[x].width = rcs[x].left = -1.0f;
+			rcs[x].top = (float)gaps[x][0] / (float)h;
+			rcs[x].height = (float)gaps[x][1] / (float)h;
+		}
+		gl_info.areas = rcs;
 	}
-	gl_info.areas=rcs;
+	else gl_info.areas = nullptr;
 	gl_info.areacount=gapc;
 
 	return true;
diff --git a/src/p_effect.cpp b/src/p_effect.cpp
index e0679338d..0f784fa06 100644
--- a/src/p_effect.cpp
+++ b/src/p_effect.cpp
@@ -764,7 +764,7 @@ void P_DrawRailTrail(AActor *source, TArray<SPortalHit> &portalhits, int color1,
 			int spiralduration = (duration == 0) ? 35 : duration;
 
 			p->alpha = 1.f;
-			p->ttl = duration;
+			p->ttl = spiralduration;
 			p->fadestep = FADEFROMTTL(spiralduration);
 			p->size = 3;
 			p->bright = fullbright;
diff --git a/src/p_glnodes.cpp b/src/p_glnodes.cpp
index 35f9f4502..0860c98b8 100644
--- a/src/p_glnodes.cpp
+++ b/src/p_glnodes.cpp
@@ -1488,7 +1488,7 @@ void P_SetRenderSector()
 		seg = ss->firstline;
 		for(j=0; j<ss->numlines; j++)
 		{
-			if(seg->sidedef && (seg->PartnerSeg == nullptr || seg->sidedef->sector!=seg->PartnerSeg->sidedef->sector))
+			if(seg->sidedef && (seg->PartnerSeg == nullptr || (seg->PartnerSeg->sidedef != nullptr && seg->sidedef->sector!=seg->PartnerSeg->sidedef->sector)))
 			{
 				ss->render_sector = seg->sidedef->sector;
 				break;
diff --git a/src/r_defs.h b/src/r_defs.h
index e8af4ea68..ee32e6c8b 100644
--- a/src/r_defs.h
+++ b/src/r_defs.h
@@ -156,6 +156,12 @@ struct vertex_t
 		heightlist = NULL;
 	}
 
+	~vertex_t()
+	{
+		if (sectors != nullptr) delete[] sectors;
+		if (heightlist != nullptr) delete[] heightlist;
+	}
+
 	bool operator== (const vertex_t &other)
 	{
 		return p == other.p;
diff --git a/src/win32/i_main.cpp b/src/win32/i_main.cpp
index 14c4791c6..906bf9539 100644
--- a/src/win32/i_main.cpp
+++ b/src/win32/i_main.cpp
@@ -1337,7 +1337,7 @@ int WINAPI WinMain (HINSTANCE hInstance, HINSTANCE nothing, LPSTR cmdline, int n
 	_CrtSetDbgFlag (_CrtSetDbgFlag(0) | _CRTDBG_LEAK_CHECK_DF);
 
 	// Use this to break at a specific allocation number.
-	//_crtBreakAlloc = 53039;
+	_crtBreakAlloc = 124459;
 #endif
 
 	DoMain (hInstance);