On CentOS, I’ve been using the Adobe Flash Player 10. I’ve had issues with the flash player crashing all of the time. I would start doing something in flash, and the the screen would go grey. Watch a movie, screen goes grey. See an ad, screen goes grey.
It appears the issue had to do with nspluginwrapper. In CentOS, all I had to do was run “yum erase nspluginwrapper”, and my problems appear to be solved.