Hi - Several years ago, I moved & did not take my cable card with me. This was before "self-installations" were commonplace. The Comcast installer tried 6 different cable cards and none would work. Luckily, I had not returned my old equipment to Comcast yet, so I went back to my old place and got my old card. Somehow, that worked, when all the other M-stream cards would not work. I recently had to return the card because I moved somewhere with uverse but I am moving back to Comcast again. I am just concerned that this might happen again. Why / how could tivo "remember" a cable card and decide only to work with one? Is there anything I can do to prevent this? I will reset the tivo, but last time that didn't work. I've heard I should ask for an installer who knows Tivo - but this last experience was with one of their tivo technicians. Thanks for any advice.