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>Hmmm. I just tried both version 5 and 6 of the control on a form with just a button that start and restarts the progressbar and it worked fine. I also tested it on a pageframe, and it worked fine.
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>I would first try to reboot, then possibly reapply visual studio service pack 3.

Rebooting doesn't solve the problem. It isn't a problem with SP3. It seems to be a problem with this particular form or page or this instance of the progressbar. I created a dummy form and it worked fine. I did finally use the ResetToDefault method on the questionable form to solve the problem.