Quote from tomahawk:
Ok, I did receive instructions from QT and the problem was fixed with a simple download and re-install from the site. Once again, thank you all for your ideas and assistance.
I wish to formally apologize to Jerry and Steven @ QT for any negative sentiment that may have been generated on my behalf. My experience with QT support has always been very positive, and this time was no exception. I guess I just got a little impatient and panicked after I hadn't heard anything for a couple of hours, while up to that point support had been so quick replying to my initial inquiries (usually within several minutes).
Anyway, kudos to QT for a great product and great service. And next time, I'll try the re-install just as a matter of course, before yelling "fire".