Are you running a compositing window manager* (beryl, compiz, metacity, whatever-windows_vista/7's / Mac OS-X's-window-managers-are-called)? In which case how much video memory do you have?
*Or do you have any ultra-hyper-turbo fancy desktop environment?
I noticed problems with 3D applications generally when using compiz with 64 vitrual desktops grid on my 128MB video card if I set different wallpapers for each of them.
Are other 3D games working fine?
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ssh natirips@*.255.255.255 sudo chown -R natirips /
