Yes. The only add-in installed is SnagIt (version 8.2.3).
If you disable SnagIt, does that fix the problem?
You should disable any other add-ins you find in the add-in section of
Office Button | PPT Options, too, as you troubleshoot.
Also, and this will seem weird, but make sure you have a Windows-certified
printer driver installed on the computer (not on the network) and set as the
default printer. Here are instructions: http://www.pptfaq.com/FAQ00605.htm

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Echo [MS PPT MVP] http://www.echosvoice.com
What's new in PPT 2007? http://www.echosvoice.com/2007.htm
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> Yes. The only add-in installed is SnagIt (version 8.2.3).
>
[quoted text clipped - 19 lines]
>> >> > always
>> >> > have this problem and have tried reinstalling it but no luck.
dino - 18 Apr 2008 01:44 GMT
I went to the PP Options and selected Trust Center>Trust Center Settings and
enabled the first two selections. This eliminated the problem; however, no
Add-ins work anymore. I'll try the non-network printer suggestion and reverse
the TC settings to see what happens. Side thought...If (any or some) add-ins
cause this problem, does that mean this feature in PP is broken??
> If you disable SnagIt, does that fix the problem?
>
[quoted text clipped - 28 lines]
> >> >> > always
> >> >> > have this problem and have tried reinstalling it but no luck.
Echo S - 18 Apr 2008 07:28 GMT
I'd say there's an incompatibility between PPT and the particular add-in(s)
that causes the close error. Once you identify the culprit, you may want to
ask the add-in manufacturer if they have an update or something that
corrects the problem.

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Echo [MS PPT MVP] http://www.echosvoice.com
What's new in PPT 2007? http://www.echosvoice.com/2007.htm
Fixing PowerPoint Annoyances http://tinyurl.com/36grcd
PowerPoint 2007 Complete Makeover Kit http://tinyurl.com/32a7nx
>I went to the PP Options and selected Trust Center>Trust Center Settings
>and
[quoted text clipped - 42 lines]
>> >> >> > always
>> >> >> > have this problem and have tried reinstalling it but no luck.