Computer hangs on log-off

When I log off, the computer hangs on the splash scree--the screen picture that is behind the log on dialogue box-- and needs to be manually shut down. The box to log back in does not appear.

Hi William,
my PBG4 shows similar behaviour at about half of my logg-offs / shut down / restart.
I have tried nearly every kind of diagnosis and repair tools (RAM, HD, file system, rights, extensions, different accounts ...) with no result. I doubt if log files would provide useful information after a forced power down because cached information may not have been flushed to disk and log files not been closed properly.
I have been following similar discussions from time to time but never found a durable solution.
The only hint I picked up was the following workaround:
Have the dock showing up while logging off.
(set permanently visible in dock preferences or unhide dock by mouse just before confirming log-off via return key)
I know it sounds strange - but it works for me!
Since I follow this advice (and don't fail to invoke the dock) there are NO more hangings during log-off / shut down / restart.
The root cause must be something about a hanging process but I have no knowledge about BSD and other things behind the Mac OS X Aqua interface.
Sorry, it's no real solution, only a workaround but could you try if this also helps on your computer?

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