If you switch window managers in the gnome control center (from say E to Window Maker), and then close X in a naughty way (like ctrl-alt-backspace), the next time you start up X you get E. This is, ofcourse, expected since you didn't save your session like the machine told you to. Now, when you go back into the control center to change the window manager again, it says you're currently running WM (even though you're not), which means you can't reselect it until you select some other window manager first.
This is still true in gnome-core-1.2.1-26 (Pinstripe2)
This is a known problem, and is quite difficult to fix with the current (GNOME 1.2) framework. It may be fixable when GNOME 2.0 comes out.
Commit pushed to master at https://github.com/openshift/origin-server https://github.com/openshift/origin-server/commit/4ad4987f5bbad0db8f5748f527f4f90cc6b022fd Issue 5427: Corrected VM account info