When watching premium channels (HBO and Showtime in particular) the closed caption is either totally missing or is garbled. CC works fine with all other channels. I have Brighthouse cable. I am running the signal through a Denon receiver and connecting it to the television with HDMI cable. Any idea what the problem might be or a suggested solution. Should I contact Tivo or BHN? Is there some problem with my settings? Thanks for any help.