At https://bugzilla.redhat.com/754036 is a Fedora 16 user running XFCE who has apps (at least Claws Mail and X-Chat) crashing in the same way when trying to display a notification. #0 _g_dbus_worker_ref (worker=0x0) at gdbusprivate.c:438 No locals. Known thing? And specific to XFCE?