Thanks for the reply

Desktop is always in 1920x1200 mode, the same mode I want to play in.
Lowering the desktop resolution to something smaller (like 1440x1050) will also force the game to that resolution. So even if I have the game in 1920x1200, it will still run the game at 1440x1050 if that is the desktop resolution. This behavior is the same no matter if I have unchecked the "UseDesktopResInFullscreen" flag or not.
I have tried three different drivers, three different OSs, SLI and non SLI, and always the same issue. I do not have any other issues in any other game.
It just seems the game refuses to render any more 3D primitives, or will no longer load the z-buffer.
I guess I just need a patch.