Thank you for the suggestions. The sd channels are not hidden. I just got off the phone at 5:45, I called Directv and was elevated to tech support. The young lady tried several things and issued an authorization for a service call to my home. It affects all of my receivers, 3 hd and one standard def, and iit only affects channel 22 Maryland Public TV. Weird huh? I'm just waiting a person to call back and set up a date and appointment to check this out,