I ordered the 'NFL Sunday Ticket/NHL Centre Ice' package. Watching football yesterday 3 of my 4 HD channels were greyed out, but worked. Not a big deal, but strange (FWIW I LOVE the new HD 'RedZone' Channel!).
Like others I too am getting a loud 'pop' when changing channels - really noticed it yesteday flipping between games. I have optical & HDMI between receivers which run out to a projector.