Index: src/debug/debug_gui.cpp
===================================================================
--- src/debug/debug_gui.cpp	(revision 4296)
+++ src/debug/debug_gui.cpp	(working copy)
@@ -67,7 +67,7 @@
 	if(buf[len - 1] != '\n' && len + 1 < sizeof(buf) ) strcat(buf,"\n");

 	if(debuglog) fprintf(debuglog,"%s",buf);
-
+	if(debuglog) fflush(debuglog);
 	if (logBuffPos != logBuff.end()) {
 		logBuffPos=logBuff.end();
 		DEBUG_RefreshPage(0);
Index: src/gui/sdlmain.cpp
===================================================================
--- src/gui/sdlmain.cpp	(revision 4296)
+++ src/gui/sdlmain.cpp	(working copy)
@@ -691,6 +691,18 @@
 		SDL_GL_SetAttribute( SDL_GL_SWAP_CONTROL, 0 );
 #endif
 		GFX_SetupSurfaceScaled(SDL_OPENGL,0);
+		        int a =-1;
+		        SDL_GL_GetAttribute(SDL_GL_DOUBLEBUFFER,&a);
+		        LOG_MSG("double buffer opengl %d",a);
+		        a = -1;
+		        SDL_GL_GetAttribute(SDL_GL_DEPTH_SIZE,&a);
+		        LOG_MSG("depth %d",a);
+		        a = -1;
+		        SDL_GL_GetAttribute(SDL_GL_BUFFER_SIZE,&a);
+		        LOG_MSG("buffersize %d",a);
+		        SDL_GL_GetAttribute(SDL_GL_STENCIL_SIZE,&a);
+		        LOG_MSG("stencilsize %d",a);
+		        LOG_MSG("bits pp %d",sdl.surface->format->BitsPerPixel);
 		if (!sdl.surface || sdl.surface->format->BitsPerPixel<15) {
 			LOG_MSG("SDL:OPENGL: Can't open drawing surface, are you running in 16bpp (or higher) mode?");
 			goto dosurface;
@@ -834,6 +846,7 @@
 #endif

 void GFX_SwitchFullScreen(void) {
+	LOG_MSG("switching mode");
 	sdl.desktop.fullscreen=!sdl.desktop.fullscreen;
 	if (sdl.desktop.fullscreen) {
 		if (!sdl.mouse.locked) GFX_CaptureMouse();
@@ -867,6 +880,7 @@
 }

 void GFX_SwitchFullscreenNoReset(void) {
+	LOG_MSG("switching mode");
 	sdl.desktop.fullscreen=!sdl.desktop.fullscreen;
 }

@@ -926,7 +940,10 @@
 		} else
 		    pixels=(Bit8u *)sdl.opengl.framebuf;
 		pitch=sdl.opengl.pitch;
+		LOG_MSG("pitch %d and pixels %d", pitch, pixels);
+		if(pixels == NULL) return false;
 		sdl.updating=true;
+		//LOG_MSG("1pitch %d and 1pixels %d", pitch, pixels);
 		return true;
 #endif
 	default:
@@ -943,6 +960,7 @@
 	if (!sdl.updating)
 		return;
 	sdl.updating=false;
+	//return;
 	switch (sdl.desktop.type) {
 	case SCREEN_SURFACE:
 		if (SDL_MUSTLOCK(sdl.surface)) {
@@ -1009,7 +1027,8 @@
 		glClearColor (0.0f, 0.0f, 0.0f, 1.0f);
 		glClear(GL_COLOR_BUFFER_BIT);
 		if (sdl.opengl.pixel_buffer_object) {
-			glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT);
+			GLboolean a = glUnmapBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT);
+			if (a == GL_FALSE) LOG_MSG("HELP");
 			glBindTexture(GL_TEXTURE_2D, sdl.opengl.texture);
 			glTexSubImage2D(GL_TEXTURE_2D, 0, 0, 0,
 					sdl.draw.width, sdl.draw.height, GL_BGRA_EXT,
@@ -1016,6 +1035,7 @@
 					GL_UNSIGNED_INT_8_8_8_8_REV, 0);
 			glBindBufferARB(GL_PIXEL_UNPACK_BUFFER_EXT, 0);
 			glCallList(sdl.opengl.displaylist);
+			glFinish();
 			SDL_GL_SwapBuffers();
 		} else if (changedLines) {
 			Bitu y = 0, index = 0;