Place: Seattle Box: TiVo HD Card: Motorola M Install: Self I realize some of this is redundant but if it saves one person some time and frustration then its worth my time posting and anyone who might benefit reading about my experiences. Bought a new HD TV and was missing TiVo big time. Bought TiVo HD online from Circuit City using a link which gave me 10% off (ends 8/31). The 10% discount, even with sales tax, made the price about the same as it would have been from out of state vendors at the time. Decided to buy local in case I got involved with a return. Picked up the box and swung by my local Comcast store. Went to the Comcast store on North 94th Street just east of Aurora. Asked for two cards and was surprised when I was given two M cards. I like to live dangerously so I took only one card. Staff at the store very cooperative. No hassles. Walked out with a card and a receipt showing 0.00 charges. Setup was a breeze. Called Comcast to pair card and it was done while I was talking to service rep. All channels came through. HOWEVER pixilation was horrible. Looked like an explosion at a checkerboard factory. Thanks to all the helpful posts in this thread I suspected the problem related to the version 8.1.7a software. Went to bed and let TiVo rest until next day. Hoped version b would come through. Next day still a mass of pixels. Still version a. Left town overnight and hoped software update would come through. Got home, pixel mess was gone! Checked and software had been updated to 8.1.7b2!! However Id lost most of my cable channels. Just local broadcast (standard and HD) and a few cable channels. Suspected might be a parity problem. Called Comcast and asked service rep to pair card again. She did while I waited. That did the trick! Checked my Comcast account online. I was being billed for two cards. Called and billing rep said Thats because you have a TiVo and youre using three cards. One for your TV and two for TiVo. Explained none for TV and one for TiVo. She said But TiVo boxes require two. Explained M card situation which she didnt understand. She put me on hold while she contacted her support director. She quickly came back and told me the card fees were removed and wouldnt show up on my monthly bill. So far so good. Pixilation is gone. Got one small flash no different from my S2 boxes. Summary: Anticipate pixilation problem with ver. a software. Anticipate pixilation correction with ver. b2. Expect software update about 48 hours after activating TiVo. Double check cable card paring if all channels dont light up. Triple or quadruple check your Comcast account for mystery card charges.