Nat,
Thanks for your advice. I have just played back a clip on my camcorder and compared it to the same clip on Videopad. I am embarrassed to say that I have discovered that the audio on Videopad is NOT in synch with the video after all! The audio on Videopad starts earlier than the video and, consequently, also finishes earlier. I could not tell this before because it seemed that my wife started talking while she had her back to me (which she didn't). Does this give you any clues?
Regards,
Michael