I've discovered an extremely frustrating bug that occurs only in
PowerPoint
2007, but none of the other 2007 office applications.

If I type text using a professional, OpenType font (such as from Adobe
Font
Folio), PowerPoint renders it correctly. But if I size this font as
66-point
or larger, the text messes up as if the character spacing was negative
causing all letters to display on top of each other.

You can see a screenshot of this error here:
http://www.DJosephDesign.com/files/ppt2007otferror.jpg . The only
difference
between the two lines of text is that the second is scaled to 66-point,
while
the first is 60-point. Try it yourself.

This occurs with and without ClearText enabled.