I had a ton of trouble getting two new Motorola M-Cards (cablecards) from Comcast to work with my two new Tivo Elites. I spent hours (at least 8) on the phone with more than a dozen different Comcast techs. Comcast sent three different techs to my house. All along I kept telling them that this was a simple database issue, and they had entered the cards into their database wrong. The third tech to visit my house told me that Comcast had recently starting handing out new cards that needed a different configuration than the old cards required. He said that he hadn't seen a Tivo he wasn't able to get running in years -- until a month ago. Then he ran into half a dozen in a week. After spending a dozen hours on the phone (for the previous customers), he finally got an explanation. Apparently, these newer cable cards (maybe a new firmware version? who knows) need to be set up in the Comcast headend database as "JD9060". According to this tech, when Comcast hands out these cards, they are normally entered in the database as "JD9062", which is the code for working in a Comcast box. When entered as "JD9062" they will not work with a Tivo -- they give errors, such as the one I was getting where the card would return "Auth: MP". He made a quick call, told them to change the card type to "JD9060", send an init hit, and I had all of my channels in about a minute. He also mentioned something about the "address mode", which should show one "S", not "SS". I'm not sure that this was part of what he had them change at the head end, but another piece of data for people having trouble with cable cards. I don't know if Comcast is actually handing out different cards, and if they are, whether all offices are doing it or just some offices in California. But the tech who told me about it seemed pretty confident that it was a change to the cards that was causing the trouble, since the old cards would work even if they were misconfigured in the database as "JD9062" and the new ones fail with the same misconfiguration. So there you have it. The cable card process was so painful, though, that regardless of the cause I doubt I'll buy any new equipment requiring cable cards for quite a while.