Comment 3 for bug 993056

via Terminal:

gnome-control-center

(gnome-control-center:8799): Gtk-CRITICAL **: gtk_box_pack: assertion `gtk_widget_get_parent (child) == NULL' failed

(gnome-control-center:8799): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(gnome-control-center:8799): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed

(gnome-control-center:8799): GLib-GIO-CRITICAL **: g_dbus_proxy_call_sync_internal: assertion `G_IS_DBUS_PROXY (proxy)' failed

(gnome-control-center:8799): Gtk-CRITICAL **: gtk_box_pack: assertion `gtk_widget_get_parent (child) == NULL' failed

(gnome-control-center:8799): GLib-GObject-WARNING **: invalid (NULL) pointer instance

(gnome-control-center:8799): GLib-GObject-CRITICAL **: g_signal_connect_data: assertion `G_TYPE_CHECK_INSTANCE (instance)' failed