diff --git a/engine/Makefile b/engine/Makefile
index 3083f133..36a907dd 100644
--- a/engine/Makefile
+++ b/engine/Makefile
@@ -48,7 +48,7 @@ ifndef BUILD_AUTOUPDATER  # DON'T build unless you mean to!
 endif
 
 # ioquake3 git commit that this is based on
-IOQ3_REVISION = b1e6ef14
+IOQ3_REVISION = 972635ea
 
 #############################################################################
 #
@@ -1090,7 +1090,6 @@ endif
 
 ifneq ($(HAVE_VM_COMPILED),true)
   BASE_CFLAGS += -DNO_VM_COMPILED
-  BUILD_GAME_QVM=0
 endif
 
 TARGETS =
diff --git a/engine/code/renderergl2/tr_backend.c b/engine/code/renderergl2/tr_backend.c
index ba3e2abb..7387101b 100644
--- a/engine/code/renderergl2/tr_backend.c
+++ b/engine/code/renderergl2/tr_backend.c
@@ -342,9 +342,7 @@ void RB_BeginDrawingView (void) {
 	{
 		FBO_t *fbo = backEnd.viewParms.targetFbo;
 
-		// FIXME: HUGE HACK: render to the screen fbo if we've already postprocessed the frame and aren't drawing more world
-		// drawing more world check is in case of double renders, such as skyportals
-		if (fbo == NULL && !(backEnd.framePostProcessed && (backEnd.refdef.rdflags & RDF_NOWORLDMODEL)))
+		if (fbo == NULL && (!r_postProcess->integer || !(backEnd.refdef.rdflags & RDF_NOWORLDMODEL)))
 			fbo = tr.renderFbo;
 
 		if (tr.renderCubeFbo && fbo == tr.renderCubeFbo)
@@ -708,10 +706,9 @@ void RE_StretchRaw (int x, int y, int w, int h, int cols, int rows, const byte *
 		ri.Printf( PRINT_ALL, "qglTexSubImage2D %i, %i: %i msec\n", cols, rows, end - start );
 	}
 
-	// FIXME: HUGE hack
 	if (glRefConfig.framebufferObject)
 	{
-		FBO_Bind(backEnd.framePostProcessed ? NULL : tr.renderFbo);
+		FBO_Bind(r_postProcess->integer ? NULL : tr.renderFbo);
 	}
 
 	RB_SetGL2D();
@@ -795,9 +792,8 @@ const void *RB_StretchPic ( const void *data ) {
 
 	cmd = (const stretchPicCommand_t *)data;
 
-	// FIXME: HUGE hack
 	if (glRefConfig.framebufferObject)
-		FBO_Bind(backEnd.framePostProcessed ? NULL : tr.renderFbo);
+		FBO_Bind(r_postProcess->integer ? NULL : tr.renderFbo);
 
 	RB_SetGL2D();
 
@@ -1173,6 +1169,13 @@ const void	*RB_DrawSurfs( const void *data ) {
 			qglGenerateTextureMipmapEXT(cubemap->image->texnum, GL_TEXTURE_CUBE_MAP);
 	}
 
+	// FIXME? backEnd.viewParms doesn't get properly initialized for 2D drawing.
+	// r_cubeMapping 1 generates cubemaps with R_RenderCubemapSide()
+	// and sets isMirror = qtrue. Clear it here to prevent it from leaking
+	// to 2D drawing and causing the loading screen to be culled.
+	backEnd.viewParms.isMirror = qfalse;
+	backEnd.viewParms.flags = 0;
+
 	return (const void *)(cmd + 1);
 }
 
@@ -1201,6 +1204,13 @@ const void	*RB_DrawBuffer( const void *data ) {
 	if ( r_clear->integer ) {
 		qglClearColor( 1, 0, 0.5, 1 );
 		qglClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+
+		if (glRefConfig.framebufferObject && tr.renderFbo) {
+			FBO_Bind(tr.renderFbo);
+
+			qglClearColor( 1, 0, 0.5, 1 );
+			qglClear( GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT );
+		}
 	}
 
 	return (const void *)(cmd + 1);
@@ -1313,14 +1323,7 @@ const void *RB_ClearDepth(const void *data)
 
 	if (glRefConfig.framebufferObject)
 	{
-		if (!tr.renderFbo || backEnd.framePostProcessed)
-		{
-			FBO_Bind(NULL);
-		}
-		else
-		{
-			FBO_Bind(tr.renderFbo);
-		}
+		FBO_Bind(tr.renderFbo);
 	}
 
 	qglClear(GL_DEPTH_BUFFER_BIT);
@@ -1378,7 +1381,7 @@ const void	*RB_SwapBuffers( const void *data ) {
 
 	if (glRefConfig.framebufferObject)
 	{
-		if (!backEnd.framePostProcessed)
+		if (!r_postProcess->integer)
 		{
 			if (tr.msaaResolveFbo && r_hdr->integer)
 			{
@@ -1401,7 +1404,6 @@ const void	*RB_SwapBuffers( const void *data ) {
 
 	GLimp_EndFrame();
 
-	backEnd.framePostProcessed = qfalse;
 	backEnd.projection2D = qfalse;
 
 	return (const void *)(cmd + 1);
@@ -1655,8 +1657,6 @@ const void *RB_PostProcess(const void *data)
 	}
 #endif
 
-	backEnd.framePostProcessed = qtrue;
-
 	return (const void *)(cmd + 1);
 }
 
diff --git a/engine/code/renderergl2/tr_fbo.c b/engine/code/renderergl2/tr_fbo.c
index 26f50c3f..b0a9478f 100644
--- a/engine/code/renderergl2/tr_fbo.c
+++ b/engine/code/renderergl2/tr_fbo.c
@@ -170,9 +170,13 @@ void FBO_CreateBuffer(FBO_t *fbo, int format, int index, int multisample)
 	}
 
 	absent = *pRenderBuffer == 0;
-	if (absent)
+	if (absent) {
 		qglGenRenderbuffers(1, pRenderBuffer);
 
+		// workaround AMD Windows driver requiring bind to create renderbuffer
+		GL_BindRenderbuffer(*pRenderBuffer);
+	}
+
 	if (multisample && glRefConfig.framebufferMultisample)
 		qglNamedRenderbufferStorageMultisampleEXT(*pRenderBuffer, multisample, format, fbo->width, fbo->height);
 	else
diff --git a/engine/code/renderergl2/tr_local.h b/engine/code/renderergl2/tr_local.h
index 668dbbdd..adbb3d59 100644
--- a/engine/code/renderergl2/tr_local.h
+++ b/engine/code/renderergl2/tr_local.h
@@ -1472,7 +1472,6 @@ typedef struct {
 
 	FBO_t *last2DFBO;
 	qboolean    colorMask[4];
-	qboolean    framePostProcessed;
 	qboolean    depthFill;
 } backEndState_t;