I mentioned kind of a similar problem over here in the Programming forum. Wfaulk said he had a knob problem too, and he sent his Empeg across the pond and they replaced it.

The odd thing is the knob on my year-old Mk2 doesn't have this problem, but the knob on the brand new Mk2a has had it since I got it. The knob on my Mk2 is almost flawless in sending exactly one IR code per "click," with my Mk2a, it's a lot of guesswork.

But it hasn't been so bad that it's been worth sending it to England... yet...