@Rob Maybe it is in gnome-session+.compiz? So you can try mv .compiz backup ; rm -rf .config/gnome-session from a terminal session, whithout any desktop session open.
@Rob .compiz? gnome-session
Maybe it is in gnome-session+
So you can try
mv .compiz backup ; rm -rf .config/
from a terminal session, whithout any desktop session open.