Andy, I've seen your friend's work and he definitely knows his gear. I've never had this issue and I've shot a lot of long shutter speed images on a tripod with both the 10D and 20D. I rarely use the mirror lockup Custom Function. With the mirror lockup the mirror flips up and then you trigger the shutter, preferably with a cable, a few seconds later. That way everything's sure to have settled down and the tripping of the shutter is an electronic function so it shouldn't vibrate anything. It's kind of a drag having to go into a Custom Function menu to lock up the mirror but it's worth it if you're setting up an interior shot and have the time to get things in place. Plus, I've always shot Canon and can't say if other manufacturers have an easier method.
He may want to send his rig in to Canon for a checkup.
Hope this helps. Can you please post the link to his work again? I can't find it.
MG
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