Broke the GUI. Needed to restart to regain toolbars and controls. ** The windows remained hanging - there I removed it and rebooted my LM 20.1 Cinnamon.
compiz/fusion programs have cause my desktop to stop working. None of the special effects work either.
This makes it easy to take control of desktop effects, for those of us who need to. It is also useful if compiz interferes with a 3d application, or for any case where it helps to temporarily disable it.
This lets me switch window managers easilly, regardless of whether or not I have my nvidia driver to be able to run compiz. It allows me use Xfce's window manager under GNOME whenever I want to. Careful if you switch to Icewm with it and then use Icewm to switch to fluxbox. I got stuck that way and had to log out to fix it.