Comment 2 for bug 762598

StacktraceTop:
 g_type_check_instance_is_a (type_instance=0x952d058, iface_type=156410808) at /build/buildd/glib2.0-2.28.5/./gobject/gtype.c:3961
 IA__gtk_calendar_select_month (calendar=0x952d058, month=3, year=2011) at /build/buildd/gtk+2.0-2.24.4/gtk/gtkcalendar.c:3782
 ido_calendar_menu_item_set_date (menuitem=0x94eb908, year=2011, month=3, day=16) at idocalendarmenuitem.c:383
 menu_visible_notfy_cb (menu=0x93d4010, pspec=0x93698f0, user_data=0x93be000) at indicator-datetime.c:290
 g_cclosure_marshal_VOID__PARAM (closure=0x93bea68, return_value=0x0, n_param_values=2, param_values=0x93c9d40, invocation_hint=0xbffefb60, marshal_data=0x0) at /build/buildd/glib2.0-2.28.5/./gobject/gmarshal.c:533