The problem is mutter, I take it you have the gnome-shell testing ppa installed? I dont know the root cause of the problem but if you downgrade mutter to the version provided by the unity ppa it should solve the problem.
The problem is mutter, I take it you have the gnome-shell testing ppa installed? I dont know the root cause of the problem but if you downgrade mutter to the version provided by the unity ppa it should solve the problem.