Thanks for the tips and advice, everyone! I guess I also should have mentioned that I already do have shims in place on both my old Northwaves and these new Sidi shoes. By shims, I'm referring to a thin, yellow plastic shim that is placed between the cleat and the sole of the shoe. I should also mention that my Northwaves had a carbon-reinforced sole...whereas, the Sidi Ergo 2's have a full carbon sole. Not that it really matters, though. But just from looking at a sideview of both shoes...the Northwaves sit a bit lower and flatter to the ground than the Sidis do. Even if you were to Google a pic of both shoes...you can immediately see a difference in the side profile of the shoes.

Yeah, I'm just perplexed (and frustrated) by this new knee pain. Mainly because this is happening on my brand new custom Seven that I just recently got. I've been riding it for a few weeks now, and up until yesterday...had no knee pain whatsoever...so I'm not entirely clear on why this has suddenly cropped up, unless it really is due to the new shoes. I just emailed my fitter explaining everything to him...so I'm sure he'll have some insight on what we can do to correct it.