[applekeynote] Keynote cancels auto shutdown

I have been searching for a solution to the following:

I run Keynote (newest version) on a Mac Mini running 10.5.3. I run a
slide show from 9 a.m.-5 p.m. and the mini is set to start and shut
down at those times. However- I always get an error that states Keynote
has canceled the shutdown process. Any solutions out there?

Here is the link to the Apple discussion thread- I am having the
identical issues as other users have posted.

Thanks in advance for your input--

http://discussions.apple.com/thread.jspa?threadID=1099402&tstart=30

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