I can confirm that removing the metacity config directory solved the issue (after a reboot because alt+f2 then r and enter to reload shell does not work at that point)
rm -R ~/.gconf/apps/metacity
I can confirm that removing the metacity config directory solved the issue (after a reboot because alt+f2 then r and enter to reload shell does not work at that point)
rm -R ~/.gconf/ apps/metacity