Playing Quake Wars works fine, tried running it windowed with Compiz, that works also, except in fullscreen it keeps flipping between windowed and FS.

Played several hours straight without Compiz as well, no crashes at all either way.

So it only happens when 1-3 or all of these are running: 1) Compiz, 2) NVidia and 3) modified themes and usually also 4) playing music or videos and drag and dropping files into the playlist (the most common occurrence of the crash).

My Compiz version is now 0.7.4, and Nvidia drivers are 173.14.09