josh@josh:~$ compiz
/usr/bin/compiz.real: Another window manager is already running on screen: 0
/usr/bin/compiz.real: No manageable screens found on display :0.0
josh@josh:~$ compiz --replace
/usr/bin/compiz.real: Another window manager is already running on screen: 0
/usr/bin/compiz.real: No manageable screens found on display :0.0