gnome_panel asserts on startup

[Clem Taylor]

gnome-panel-2.13.91-5.x86_64 is asserting on startup:
** ERROR **: file orbit-object.c: line 149 (do_unref): assertion failed:
   (robj->refs < ORBIT_REFCOUNT_MAX && robj->refs > 0)
aborting...

I have the current verison of orbit installed (ORBit2-2.13.3-1.2).

I tried moving away my .gnome* and .gconf*, but it still fails
(however, I'm not sure it is the same assert).

                                       Any ideas?