Thanks for the reply Moth3r.

I am actually starting to wonder if this could be some kind of AC / Power interference. My ADVC currently draws power from my iMac's 6-pin Firewire port. I am beginning to wonder if I might be better off buying the ADVC AC Adapter Kit.

FYI the LaserDisc player is plugged into an 8-way surge protector extension lead, which in turn is plugged into the mains.

I am at work at the moment. When I get home tonight I will do a raw capture of the first few chapters of Jedi to show the problem. :)