Comment 5 for bug 49594

Does the same problem happen when you log out *properly*? :) If this only happens when you forcefully kill X, I doubt the Gnome developers would be interested in looking into this issue, because recent versions of gnome depend on a whole whack of background processes that don't get killed off properly when X is killed using the emergency "Control+Alt+Backspace" key combination. That's because that key combination is not really for normal use...