Can you test one of those files on another system to determine whether it still
occurs? If not, can you send me a "mini" version on your presentation. Just
save the presentation with a new name and then delete all but a few of the
slides in that file. Open it in slide show mode and if it still demonstrates
the problem, send it to me at
sonia @ soniacoleman dot com. I have several systems to test on and have
different versions of PowerPoint and Windows.