I have a new XL4 and I wanted to check out what the signal strengths are- not that there is any problem, I just wanted to see if the strengths were good or marginal. I went to the settings/channel menu and when I select channel signal strength I get a message saying that I can't get signal strength because I don't have any digital channels. Of course ALL my channels are digital. I don't have this problem on my two tuner Premiere. Is this some kind of bug?