Additional: While Nikola suggests that the problem is removed when she logs out and back in under Unity, this is not the case for me under gnome-shell: It will often occur again after a couple of hours after logging out and in again.
Additional: While Nikola suggests that the problem is removed when she logs out and back in under Unity, this is not the case for me under gnome-shell: It will often occur again after a couple of hours after logging out and in again.