For a couple of days HGTV (the only channel with a problem) would produce a “scrambled or bad channel” dialog – no pic, no sound.
This morning (6/13), I got a real shock – All channels (at least the 5-6 that I checked, including local Los Angeles) were all “black”. I have a 2700A, with auto-roll on – Nevertheless, I checked the keys on the net and receiver, and everything looked fine. So, I rebooted the receiver, ran EPG – now, everything is OK, including HGTV. I don’t pretend to understand what happened, although I would love to know.