Has some strange black flickering (screenie http://i.imgur.com/dUOSudN.png http://i.imgur.com/dUOSudN.png). I'm a webgl developer and WebGL works perfectly fin

Has some strange black flickering (screenie http://i.imgur.com/dUOSudN.png http://i.imgur.com/dUOSudN.png). I'm a webgl developer and WebGL works perfectly fine otherwise (no crappy driver, no crappy GPU etc.) Browsers: Firefox 26 and Chrome 32.0.1700.107 (error visibile in both) OS: Linux Ubuntu 13.04 GPU: GTX-780 Driver: nvidia 331.20