What is your audio config on the 942 since for TV1 you go DVI, and the 942 has only 1 set of audio outs (for TV1). Are you using the 942 and 622s in single mode and using TV2 for audio out or are you going toslink out? I have a 622 to my Optoma DLP and it doesn't have audio out and is DVI only so I have to either split my audio signal or possibly use TV2 out in single mode. I've had the 622 for less than a month now and just bought a used 942 for my bedroom. I must say if the 942 is anywhere near as good as the 622, I'll be happy; happier than my 811s.
I'm using 2 channel audio with a 6in Y-splitter off of channel 1 to both TVs for both boxes (not trying the audio via HDMI). I have optical to my A/V Receiver in my main room for doing surround sound when I want it (not very often these days, except with watching CBS football because its hard to hear the announcers off of 2 channel audio with all the other 'sounds' they put in the mix).
FWIW, I am combining the RF outputs from both boxes and feeding that out to the other 2 TVs in my house... In theory I can be watching 4 different things on my 4 TVs, 2 in HD... But as it is, I very rarely take either box out of single user mode. Just love having the 'ability' to do it though.
I just wish that Dish would have a remote that would do UHF Plus commands off of the Aux button. When I had this same setup with my 501 and 942, I could control both boxes with a single remote for each room (the 6.2 remote will do std UHF commands that the 501 would use on the Aux button). Now I have to carry remotes around with me depending on which box I want to use in that other room. Oh well, better than not having UHF at all...