Comment 20 for bug 740767

The only thing I've found that works to get around the problem that the old, broken setting (gtk-window-decorator) replacing the correct one (compiz-decorator) whenever you log out & in is actually manually making /usr/bin/gtk-window-decorator a symlink to /usr/bin/compiz-decorator.

Not a particularly pretty workaround, but at least I can use window menus now...