Ah sun fire. Good stuff. Usually avrs can be set so if they get a 2 channel signal they can move to something else like dts neo6 which is how I set my Denon. Then if it gets true 5.1 it goes to that. Are you still getting all the vocals an such? I recall back in the day, and I think it's still there, if you hit the green button in the ok remote during live tv you can cycle through the output formats. Maybe try that and see if you can go to regular PCM and then he surround for those shows that are an issue. At least for now.