xfce4-tips should fake a session id, because else with the autostart system, the tips will be restarted by the session manager and afterwards by the autostart system.
Fixed with revision 22725. 2006-08-12 Benedikt Meurer <benny@xfce.org> * xfce4-tips/main.c(main): Fake a session id, so the session manager will not save the tips as part of the session. Bug #1089.