I have not bothered to look closely at the TV setup in a while. Everything seemed to be working fine.
So recently I was wondering when the new series (season 12) of Big Bang Theory would be coming out - I had not seen any new episodes in my recordings for a while (viewing from Theater View>TV Shows). I go on-line and find out the new series began Sept 24. And now it's Oct and three episodes are already out - but MC was not recording them - why not?
Then I notice that three channels (2-1, 2-2, 6-1) were no longer showing in MC (TV Stations), and Big Bang Theory is on CBS (channel 6-1). so for some reason the first three tv channels in my setup were deleted from MC.
I don't know when, or why, this happened, or how long it had been like that, but a new "Channel scan" restored them and everything is back to normal. I was able to record episode 4.
So I mention this, to remind everyone to periodically check your setup/settings, as things can change without your knowledge.