Comment 6 for bug 977910

I would focus on the xfce bugtracker in the future, as it seems to be an upstream bug.

Regarding xinerama, are you using the internal and external monitor at the same time? Showing different content or in cloning mode?

I run xfce on 3 machines and see the problem only on one machine, the only one with two monitors attached (the other two are laptops).