I looked, but found nothing on this issue. When I switch from a SD channel to any HD and then back to a SD channel they are gone, it say to call D Ext 721 or whatever to activate , now here is what I have to do to get these channels back. I have to unscrew one of my cables from either sat 1 or 2, then reconnect it back , I have to do this every time I go from a HD channel ( Not OTA though ) Just D's HD channels ( I know there's not many , lol ) Anyone know why this is ? Could it be my multswitch that all my cable run from ? I only have 1 HD tivo receiver and 2 SD Tivos and I don't have any problems with them. Also I have rebooted many time and this does nothing . Thanks for the help.