Applying the patch that Peter Clifton suggested here (https://bugs.launchpad.net/ubuntu/+source/libxrandr/+bug/307306/comments/23) to libgnome-desktop-2-11 fixes the problems for me.
Applying the patch that Peter Clifton suggested here (https:/ /bugs.launchpad .net/ubuntu/ +source/ libxrandr/ +bug/307306/ comments/ 23) to libgnome- desktop- 2-11 fixes the problems for me.