Shutdwon or Restart only logs me out

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http://askubuntu.com – My workstation at work is running 11.10 (lighdm). Shutting down or restarting has always worked up till last week. My workstation is generally left on through the week and shutdown at weekends. When I click either Restart or Shutdown, it just logs me out. Is there any logs I can see that will point to errors? What might cause this? I haven't got auto login checked (as one answer suggested). (HowTos)