That behavior sounds consistent with attaching a sound to a slide
transition, which based on your explanation you did not do. Nonetheless, I
have witnessed PowerPoint get confused about how to handle a sound. It
really is one of the program's weakest areas -- no ability to fade, poor
synching, weak storage options. I often see objects of an animation sequence
not begin until the sound ends, even though I have specifically told them to
play together. Usually, I can fix this by jiggling the animation or removing
it and re-applying it. Have you done that?
If you don't resolve this, I invite you to upload the file to
www.altman.com/upload. I'll take a look...
Rick Altman
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Author
Why Most PowerPoint Presentations Suck...and how you can make them better
www.betterppt.com
Host
The PowerPoint Live User Conference
Oct 28-31 | The French Quarter of New Orleans
www.powerpointlive.com