Sounds good, Lee, I'm listening to Ilya Murometz at the moment. My only thought is that if you can now play the same passage without experiencing the same problem maybe those Russians at Easter loosened up a connection which hadn't previously been quite tight enough to hold them. You're right though that it should have affected all the drivers at that moment, not just the tweeters.
Edit: however, just in case something is loose internally in the right speaker, if that ever happens again, switch the speakers around to see if that changes the result.
