PPT 2007 is harder on printer drivers than previous versions. Try installing
a Windows-certified printer driver and set it as the default printer. You
don't have to hook up a printer to the system -- you just need the driver.
Here are instrux for installing a Windows-certified driver:
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
Fixing PowerPoint Annoyances http://www.oreilly.com/catalog/powerpointannoy/
>I have a user with PowerPoint 2007 and when opening 2003 presentations the
> text boxes are not displaying properly. They are using a typical Times
[quoted text clipped - 14 lines]
> is corrected. I have suggested Office 2007 be re-installed, but any other
> ideas?