Update:
I should add that the previous update to 'gnome-session' and 'gnome-session-common' (3.0.1-0ubuntu1~build1) did not cause any login problems either. Using same settings as in my previous comment.
Update:
I should add that the previous update to 'gnome-session' and 'gnome- session- common' (3.0.1- 0ubuntu1~ build1) did not cause any login problems either. Using same settings as in my previous comment.