Can't Log Out, Shut Down, or Restart after 10.5.2 update

Since updating I've been unable to log out any user, though I can switch between users via fast user switching. Selecting Restart, Shut Down, or Log Out [User] makes any active windows become inactive, but does nothing else. (The same happens selecting restart from the system prefs or an updater/installer.) After the 10.5.2 update I had a major kernel panic that locked-up the whole machine and had to hard shut down. I've had several mini-panics since then, but the machine operates normally otherwise. I did a thorough Apple Hardware test and everything passed. None of the utilities I ran could find any issues. I am able to Restart and Shut Down via the Login Window (under the fast user switching menu). I have to enter an Admin account override, so I'm not sure if this is causing any system damage. I'm very frustrated with my very new computer. Any help or insights would be greatly appreciated.

This is then not a permissions issue with your existing accounts since it is system wide.
Your hope is that if you run Disk Utility Repair Disk Permissions would fix and Apple Installer installed files (the main system) permissions. Also do a Verify Disk to check for any underlying directory corruption. The safe boot means the issue is not extensions or fonts. There could still be a plugin somewhere screwing things up but it is unlikely.
If repairing the system file permissions and downloading and re-applying the 10.5.2 combo update does not resolve the issue you have corrupt files in the system and need to reinstall the system.
There is one more potential source and that is what are known as page faults. These originate with cache files which can't be loaded back as expected. This is a conflict issue and could be the source of the problem.
You can manually dump the root and system cache but a better alternative is probably to download a program like Yasu. It is configurable, has a simple interface and will repair permissions and clean the cache.

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