For years I have had the same set up & anytime I watched TV on Dish or streamed Prime Video or Netflix from my Hopper all the speakers worked with surround. It worked last night & when I turned it on today the receiver shows PCM & only the front left & right speaker are working & show up on the receiver both on Prime & Netflix. If I go back to the dish channels it goes back to surround & PCM goes off. I can't figure out what's going on. My smart tv streaming apps are on a different input & work with surround.