Didn't know that about the advanced plus, but that's not involved in this particular problem. Good to keep in the back of my mind though.
Yes, apparantly the issue is not having a tuning adapter for SDV. I can't decide if Cox employees are that stupid, or if the company line is to make it as hard as possible to use CableCards so that people rent their boxes instead. My mom went to their office twice to get CableCards (first one, then swapping it out to see if that was the problem.) She had a subcontractor out to the house, and has spoken to at least three people on the phone (two to pair cards, one to talk about the problems in between, there may have been others.) *NONE* of the people she interacted with indicated a tuning adapter was needed for this area.
After being at her house and getting the exact wording of the wrong state error message and googling, it sure seemed that it was the lack of a TA so I called and very specifically asked and was told yes they've been using TA's in this area for about three years now.
She's going to stop by and try to pick one up (I gave her as much info as I could so when she gets the usual "I don't know what that is" from the employee she can guide them to what she needs) and we'll see what happens.
Thanks for assistance guys and gals! Will post back if I still have problems