I have my setup as such - Cable box into Xbox (HDMI), xbox into TV (HDMI), TV sound out into receiver (Optical cable).
Up until last night, I had it set to stereo, but decided to get the 5.1 switched, as it wouldn't let me before. Found a tip to change the TV connection to HDMI, instead of HDMI (auto detect).
Then I followed these steps : http://support.xbox.com/en-US/xbox-one/system/configure-audio-settings
When I put it to 5.1 uncompressed, on certain shows (such as Sunday Night Football) the main audio was missing. For example, I got the crowd noise and music, but the announcers were missing.
Any ideas on what could be causing this? All the speakers are working, and I have it surround sound beta turned on. Any help would be appreciated!