it seems that every time Apple release a new update to firmware or itunes, weird things start to happen to the ipod with regards to the simultaneous use of MC. i for one don't believe it's JRiver's fault, it's Apple's. i doubt they send a memorandum to JRiver saying "Hey guys, FYI we've changed this and that and et cetera, regards Steve Jobs".
for the record, the default options of itunes have screwed my system up (that "Organise my music for me" option was a killer, took me hours to put it right). MC or any other program i've installed (as far as i'm aware) would never just move a load of files around without asking *very* politely first.
are we all to expect the MC team to spend hours (and therefore money) chasing the random whims of Apple? i suppose we are, but i'm guessing there are other priorities and as long as they aren't major issues it gets put on the back burner.
i use itunes when i have to, but i exclusively manage my ipod with MC. works for me, and i'm guessing the majority. hopefully JRiver will sort the glitch out, but then Apple will prob do something else to mess it all up again (i'm not suggesting they do it on purpose of course - they could be a little more communicative i'm sure).