We just got our Cable cards installed yesterday (California East Bay Area). The installer tech said this was only his 3rd Tivo S3 installed. He left w/o checking that both cards were fully functional. Result: Cable card #1 works fine, Cable card #2 only a limited # of channels, (2 thru 33), plus the HD mirrors of the basic cable channels. It's definitely the cards and not the Tivo box itself, b/c when we reverse the order of the cards, the card in slot #1 only gets limited channels, and the card in slot #2 then gets all the channels. Called Comcast, they tried sending a reset signal to both cards -- no joy. So a Comcast rep is supposed to make another housecall on Saturday. :-( At least one cable card works.