i tried your suggestions. unfortunately, they did not fix the problem. there
is no "red x" when the ppt is played on another computer. the slide is just
blank. and these are maps, not sounds or movies, which are not addressed in
the help topic you gave me. although the tips are not useful for this issue,
the tips are good ones and i did learn from them. so thank you for replying.
the situation seems to be some kind of incompatibility between versions of
ppt. nan