systemd - kdm - xfce session: shutdown and reboot disappears randomly

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https://bbs.archlinux.org – I use systemd and kdm as login manager; my desktop is XFCE.Immediately after login, if I click the logout button applet in the xfce panel, I can access all the options (shutdown, reboot, etc).But sometimes, after a while during the session, the shutdown and reboot option simply disappear - only logout works. If I log out to KDM and then again log in, they reappear.Does anyone have a clue about this? daneel971 https://bbs.archlinux.org/profile.php?id=15598 2012-09-10T17:33:28Z (HowTos)