Yes the Onkyos were both 777 or something(it sounded aero at least)and they are both 6.1 and the Kenwood I'm not sure what the model was but it was a 6.1 and 7.1 capable. The other 2 were a Yamaha which is a dd and dts but its only a 5.1 and it doesn't seem to auto select because it had a button for which mode, it didn't glitch at all. The other was my outlaw which acted the same. These tests were with there dvd player, my ps2 and a donor panasonic. All with optical out. If they were to have an issue it didn't matter which player. The only test I have left is to try the coax input instead of the optical on mine. These tests don't mean anything positive but I just wanted to get an excuse to play with HT equipment and see if others were experiencing the same things.
It was a busy but very fun day.

m-mmeyer