This bug has been fixed:
"cornwall@cornwall-desktop:~$ compiz compiz (core) - Error: Screen 0 on display ":0" already has a window manager; try using the --replace option to replace the current window manager."
This bug has been fixed:
"cornwall@ cornwall- desktop: ~$ compiz
compiz (core) - Error: Screen 0 on display ":0" already has a window manager; try using the --replace option to replace the current window manager."