I just tuned to the Cubs game on WGN-TV (the local Chicago channel) on my DirecTV HD receiver (via HDMI), and to my surprise, there was no commentator audio whatsoever; however, when I viewed the same DirecTV receiver using my SlingBox, I was getting the commentator audio just fine. Also, when I changed the channel on the TV to something else and then back to HDMI, I was able to get the commentator audio just fine again. I take it there was probably some sort of HDMI-related issue, but what went wrong? I was able to get all of the other audio from the channel I was watching (stadium microphones, bumper music when going to break, full commercial audio), but not the commentators' audio. I'm hoping to maybe learn a little about the technical details about what happened here.