Comment 5 for bug 1223332

I have noticed serious graphical issues that occur when e.g. watching a video in the web browser (e.g. watching an HTML5 video in YouTube; I don't have flashplayer installed). The graphics will start to slow up and then lock for a few moments before "releasing". If watching on an external monitor, after the lock-up releases both screens will become active and mirrored, and it is not possible to reset to single monitor settings via the System Settings dialog. The report of the crash then arrives at next login.