Hey Cheesehead--I'm in Arlington too, and also trying to set up an M-Card. I got a host ID fine yesterday and also had the right station IDs for channels, but didn't get any reception. I just bought the TiVo HD, so I believe I'm still working on old software (8.something). If I run into any of the same problems on my next attempt or get a good local CSR, I'll let you know...I'm going to the Comcast office on Wilson Blvd. after work today to try to get a few cablecards to try myself and see if any of them have been successfully paired.