When I run it, it starts up, and the menu is fine (the font is a little messed up for the loading screen, but no biggie). But as soon as I get to the main menu, the entire background is black. It's almost as if the interface is there, but it's not rendering anything. The same happens when I get ingame. It refuses to render anything (it's all black) but the rest of the interface is there.

I'm running a AMD phenom IIx6
8gb of RAM
Nvidia GTS 450
Ubuntu 11.10 (with gnome 3)