Re: OpenGL fullscreen resize problem
To me it sounds like the display section of your videocard isn't properly configured. In case of X all resolutions which you want to use need to be in this section. Right now the one for 24bit (your default depth) looks like:
Virtual 1600 1200
Change it to:
Modes "1600x1200" "1024x768" "800x600"
Further you can add any other resolutions you want to it aswell.