The usual culprit for this is that images were copied and pasted into the
slides, rather than Insert > Slides > From File. The way to make it work is
to reinsert the pictures with Insert > Slides > From File.
--David

Signature
David M. Marcovitz
Microsoft PowerPoint MVP
Director of Graduate Programs in Educational Technology
Loyola College in Maryland
Author of _Powerful PowerPoint for Educators_
http://www.PowerfulPowerPoint.com/
> When opening some of my PPT files in v2003 on my PC that were created
> on my Mac (version X I believe) some of the slides are blank. These
> are mostly but not all image slides (images were inserted and not
> referenced). Other slides are fine. Any suggestions?