bob hazard, you are facing bug 579683. disable the gnome-shell ppa from software sources and install mutter from Ubuntu repositories..
$ sudo apt-get install mutter/maverick mutter-common/maverick libmutter-private0/maverick
bob hazard, you are facing bug 579683. disable the gnome-shell ppa from software sources and install mutter from Ubuntu repositories..
$ sudo apt-get install mutter/maverick mutter- common/ maverick libmutter- private0/ maverick