The gconf2 command given in the bug description also fixes it for me:
sudo gconftool-2 --direct --config-source xml:readwrite:/etc/gconf/gconf.xml.mandatory --type string --set /desktop/gnome/session/required_components/windowmanager metacity
The gconf2 command given in the bug description also fixes it for me:
sudo gconftool-2 --direct --config-source xml:readwrite: /etc/gconf/ gconf.xml. mandatory --type string --set /desktop/ gnome/session/ required_ components/ windowmanager metacity