I have a new Mars conversion on my Hamilton changer. Lately I have customers coming up to me and saying that the changer is taking their money. So I check to see whats happening and sure as crap the bills are sitting in between the stacker and the belt drive system. It is happening more often when the stacker is empty. It seems like the validator takes the bill, tries to reject it, does the pulsating, only to accept it but without giving the change. Has anyone else experienced this?