Same problem for me. I found this problem yesterday.
lgy@lgy-laptop:~$ gnome-do
(Do:7556): Wnck-CRITICAL **: wnck_set_client_type got called multiple times.
(Do:7556): GLib-GObject-CRITICAL **: g_object_ref: assertion `G_IS_OBJECT (object)' failed
......
Same problem for me. I found this problem yesterday.
lgy@lgy-laptop:~$ gnome-do
(Do:7556): Wnck-CRITICAL **: wnck_set_ client_ type got called multiple times.
(Do:7556): GLib-GObject- CRITICAL **: g_object_ref: assertion `G_IS_OBJECT (object)' failed
(Do:7556): GLib-GObject- CRITICAL **: g_object_ref: assertion `G_IS_OBJECT (object)' failed
(Do:7556): GLib-GObject- CRITICAL **: g_object_ref: assertion `G_IS_OBJECT (object)' failed
(Do:7556): GLib-GObject- CRITICAL **: g_object_ref: assertion `G_IS_OBJECT (object)' failed
(Do:7556): GLib-GObject- CRITICAL **: g_object_ref: assertion `G_IS_OBJECT (object)' failed
(Do:7556): GLib-GObject- CRITICAL **: g_object_ref: assertion `G_IS_OBJECT (object)' failed
......