Playing video segfaults Xorg with Overlays enabled

[pln]

This seems not to be a udev or glib Problem.

With overlays disabled, everything works fine.
Enabling overlays, with twinview/xinerama on/off, crashes X when running mplayer or comparable progs.

I attached also a strace and a valgrind output from a faulty session.

For now, i use no overlays, but i hope it will help to fix some of the million bugs. Says valgrind :-)