Alas, I may have to have Comcast come back out and replace one or both of the single-stream cards in my second TiVo HD. Some of the Preferred Plus digital channels, such as BBC America, Oxygen, and Encore, are not showing up, even though I'm able to tune HBO, Showtime and some other premium channels. One tuner is missing only BBC America, while the second tuner won't show a number of Preferred Plus channels. All the digital starter, local HD channels, and premium channels are coming in fine. The first TiVo HD, which has a multistream card, is showing all channels on both tuners. So I'm thinking Comcast turned something off. Sigh.