I'd like to know the answer to this as well. I had the same issue with my hr20. The second tuner would not work with the bbc. I swapped the cables and the problem stayed on the second tuner. Once I took away the bbc the tuner worked. (After a restart.) They already sent me a replacement unit but it is refurbished. I have had only minor issues other than this one on my original hr20. I would like to here some input from you guys.