Thanks MPTAK! I never knew you could define track and follow in a scene description like that. By putting a 'follow' object on a piston, you can have a camera traverse like a 'dolly' shot. I've always tried doing this by starting the simulation, then assigning track and follow by right-clicking, but this is really much better.

I suggest you repost in the tool's own thread - you're more likely to get a response - also see if you get error messages in the Ruby Console, provide screen shots of settings etc, as there are many possible causes, and Fredo is not psychic...