I have been having a problem with YouTube videos freezing up my system when I'm in full screen...the only option is to Alt+sysrq+k to get out of it. I'd like to try and trouble shoot it, because its a real pain to have to go back to the log on screen and sign in again. It only happens full screen.

Nvidia driver ver 304.43
GeForce 7600 GS
Linux ver 12.04