I've sent the bug upstream now:
http://bugzilla.gnome.org/show_bug.cgi?id=423855
** Changed in: metacity (upstream)
Importance: Undecided => Unknown
Bugwatch: None => GNOME Bug Tracker #423855
Status: Unconfirmed => Unknown
--
metacity crashes with Deviant theme
https://launchpad.net/bugs/97066