I recall a problem similar to this almost 2 years ago with old software, but Quintum quickly came out with a patch and it was never seen again.
I would suggest you send this in to Quintum along with all information. The problem may be that if they cannot see what is going on, they may not be able to see how to fix it. I seem to recall a telnet log in the system that if someone were to capture this log Quintum may be able to see more info. They also had a software that would log each keystroke and can see how they are doing it.
I will also send your message to an associate at Quintum to help get the ball rolling, but it may carry more weight from a customer.