It has to be a firmware issue since nothing else in the system or the environment was changed and autocalibration has always worked in the past (though it never quite got things right).

I've just tried listening to some 5.1 music programming and there is definitely an audible improvement. So in spite of the glitches, it seems to be a worthwhile endeavor to upgrade.

Out of curiosity, I wonder if Sherwood firmware would work in our units or if Outlaw firmware would work in a Sherwood?

Cheers,