I haven't heard of others running into reversed left and right channels. It sounds like you've checked your wiring, but it wouldn't hurt to double-check the entire signal path (including connections into and out of the amp) - I've had surrounds get messed up and taken some chasing down.

The firmware update reportedly significantly helps or eliminates the "no audio" problem - hopefully it'll do the trick for you.

Feel free to kick around things here, and perhaps some of the crowd here can help chase down things. Oh, and welcome to the forum.