Fedora 12 does not shut down. goes back to logon screen

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http://forums.fedoraforum.org – Hi, I updated from Fedora11 to Fedora12. Now I would like reboot / Shutdown the system but it does not reboot. Whenever I click Reboot or shutdown, it comes back to login screen without booting. Any help is highly appreciated before I press power off switch. Also, ABRT service is not running is flashing at corner. Thanks for your time and help. Regards Raju Update: From terminal, running "shutdown -r run" helpded to shut down and after that the issue is fixed. (HowTos)