I recently lost 173 (ESPNHD) on my S3 TiVo on both tuners. My Sansung HD TV also has a Comcast CableCard and it works fine. I tried rotating the cards, didn't help, all the cards get 173 in the TV but not in the TiVo. Restarted the TiVo, didn't help. Unplugged the TiVo, didn't help. Erased everything, re-ran the guided setup, didn't help. This is driving me nuts! I can watch ESPNHD (173) on my TV, but I can't record/rewind/skip commercials (all the fun stuff I bought the TiVo for) All the other HD channels work fine! Anyone have any idea what the deal is here?