If you don't know where to find CompizConfig Settings Manager (System>Preferences) or don't have an entry in your menu you can launch it by firing up a terminal and typing in: ccsm
Select the preference option (in red)
Select the Reset to Defaults option (in red)
Now Compiz Fusion will reset and everything will work again. You may have to reconfigure you settings again.
If you wonder how my setup looks you can download my compiz-fusion setting profile here.
edited by pHreaksYcle