Comment 22 for bug 1301623

Looks like an old nightmare returning :-)
I often use workspaces and change windows between them. I've had the first "freeze" this morning.

Whilst waiting a patch, y You don't need to reboot. Simply got to console (e.g. Ctrl+alt+F1), identify de gnome-session PID (ps -ef | grep gnome-session) and kill it. The graphic console will return to the login screen.

And yes; it doesn't freeze if you grab the center of the screen you're moving, not the bar.