The raised events actually still exist on the master though they are not being used in any of the interactions.
So if I assign a raised event on something on a master (say, OnClick), and subsequently remove that OnClick event from that master, the event is still visible in the Interactions list when you put the master on a page. That's an interesting (not to say confusing) feature that I'm glad I now about now :-)
As to the original issue, I'll see if I can remove any sensitive stuff and send you copy.