I'm having problems with Youtube and some other stuff lately. Fullscreen videos are stuttering/freezing, I guess theres a problem with my Xorg process:

http://ubuntuone.com/6oEf3PVMt8DofYCO2CyPnH -Normal
http://ubuntuone.com/45pEIWd2THZWwqQpuA4W6C -After exiting fullscreen
http://ubuntuone.com/1QjvmR1nsaXvPiH0gzgkMQ -When browsing launchpad.net

Is it corrupted driver data or something?

I'm running Ubuntu 13.04 32bit on:
Core 2 Duo e8400 3.00GHz
GF 9600gt 512MB with 313 update driver