Looking here may solve your problem.
RED X instead of graphics
http://www.rdpslides.com/pptfaq/FAQ00064.htm
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Michael Koerner [MS PPT MVP]
"john mcmichael" <(E-Mail Removed)> wrote in message
news:F8EE57F9-C256-4DFC-BB4F-(E-Mail Removed)...
|I have a PowerPoint presentation that I have been given to edit. When I
open
| the presentation all charts show as large red "X". When I double click on
| the "X", the chart appears normally. However, when I save and close the
file
| and then reopen, the red "X's" reappear. Any thoughts on what might cuase
| this?
|
| Thanks