OK, two things to check.
1) Try changing to a different font and see if the problem persists. It is
possible that the font has become corrupt. You may also want to deselect
embed fonts in the presentation (if that option is selected). In PowerPoint
Tools => Options => (tab) Save => Font options for current document only =>
Uncheck (if checked) => OK
2) Try round tripping the presentation thru HTML to remove minor corruption
from the file. See
** HTML "Round-tripping" to repair corruption
http://www.pptfaq.com/FAQ00526.htm
--
Bill Dilworth
A proud member of the Microsoft PPT MVP Team
Users helping fellow users.
http://billdilworth.mvps.org
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vestprog2@ Please read the PowerPoint FAQ pages.
yahoo. They answer most of our questions.
com
www.pptfaq.com
..