Voice/video out of sync

Towards the end of a project I am building, I have several slides that describe elements that appear on the screen.  The first of these slides is about 39 seconds long, with voice running the entire time, and 4 highlight boxes that fade in (and sometimes out) in sync with when they are being discussed in the audio track.  When I first programmed it, I didn't have any problems, but now, when I am playing the project, regardless of preview mode or as a published presentation, when this slide completes, the audio for the next slide begins, but the video stays on this slide.  When I click the forward button, it syncs back up for the next slide (repeating the audio portion), and does the same thing at the end of that next slide.
Any ideas?
Thanks!
Michael

Okay, so I may have my own answer after fiddling around a bit.
One of the programmers at the LMS company we use mentioned (in response to a completely different issue) that my problem might have something to do with my browser cache.  Well, lo and behold, I ran the course, it did it's funky out of sync thing, closed it, cleared my IE history (all except passwords) and ran it again with no problems.  Has anyone else ever experienced issues with the browser cache?  Is it something that you have ever seen affect your students/learners?
Thanks,
Michael

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