Comment 6 for bug 235522

I'm also having the same problem. It happens with Totem, VLC, and MPlayer. It doesn't matter if I play audio or video, the system hangs as soon as the program is opened. The mouse cursor still moves, but the system is otherwise unresponsive, even to Ctrl+Alt+Backspace.

This used to happen only once in a while, but now happens consistently every time since the latest xorg update. I haven't seen it hang if I disable compiz, so maybe it's an issue with that? I use the intel (945GM) drivers.