Gedon:
Yes i am certain that it is one of the fixed products.
So far we've got no evidence to back that up - unless you've watched the pulses get generated conforming to the new version on a scope or similar, your sketch result certainly could be due to the issue they describe.
[quote author=Multi-coin Acceptor Debugged]Worse, too many pulses were being generated: the Five peso coin churns out 40 pulses; the ten peso coin generates 80 pulses! Even at its fastest pulse rate setting, one will have to wait 40 seconds before the acceptor finishes the pulse transfer of a 10 peso coin.[/quote]That sounds very much what you've described in your original post.
If you've got no way to directly view the output pulses, I'd be contacting the supplier with your symptoms and getting them to work through this with you. Potentially get them to send you a replacement they've tested.
Geoff