Yesterday I turned in one of my three Cox Cablecards. I sold the unit and no longer needed it so...a big $2 a month savings. Anyway, today my Elite started giving me the "Channel not authorized, V58" message, along with a black screen. A reboot fixed the problem, but only for a couple of hours. I called the 800 number for Cox cablecard activation. I explained to the rep my problem and told him that I had just turned in a CC, the day before. I asked him was it just a coincidence. He said "I see the problem. The card that you turned in was the number one card of the three". I think that he called it a Lead card. He switched the number three card to number one and it fixed the error instantly. I have never run into this problem before and I thought that I would pass it on. Honestly, I thought that he just sent a "Hit" to the card, but he said no, he didn't.