This is odd.  The crash is in the child-focus-changed signal handler,
which is getting passed an unexpectedly NULL box.  The same behaviour is
evidenced by the nl-places-manager, too.

The strange strange thing is that at the point the signal is being raised, 
child->box is a perfectly valid object.  Somewhere between
g_signal_emit_by_name (actor, "child-focus-changed", &child->box);
and the on_child_focus_changed signal handler actually getting called that 
pointer is getting NULLed.

While I was there I noticed that the marshaller set for the child-focus-
changed signal in ctk-actor.c looks wrong; it's
g_ccloseru_marshal_VOID_ENUM, but the signal gets passed a
ClutterActorBox *, not an enum.

-- 
netbook-launcher crashed with SIGSEGV in g_cclosure_marshal_VOID__ENUM()
https://bugs.launchpad.net/bugs/514083
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