Comment 4 for bug 1068994

My findings show that it's trivial to reproduce with unity by opening menus quickly (indicator menus for instance). Can't reproduce it with plain metacity. One way to mitigate the issue is to use the gui in a more "relaxed" manner :) That should make it harder to hit the race condition with input grabs.

and the issue seen after using xrotate to switch to portrait mode is something else (cursor jumping here and there), since it works fine after rotating back to landscape.