I have the same problem and my local cable provider (Cox) is trying to figure out how to fix it.
Last night I happened to be at a house with a fully-functioning CableCARD device and I took the opportunity to check their setup. I noted a couple of key differences.
Their Host ID screen has the CableCARD number, Host ID and a message "Authorization Received"; both of my cards are missing the latter message.
Their CP screen reads "Auth Status:CP Auth Received"; both of mine read "Auth Status:Waiting for CP Auth".
Last night I happened to be at a house with a fully-functioning CableCARD device and I took the opportunity to check their setup. I noted a couple of key differences.
Their Host ID screen has the CableCARD number, Host ID and a message "Authorization Received"; both of my cards are missing the latter message.
Their CP screen reads "Auth Status:CP Auth Received"; both of mine read "Auth Status:Waiting for CP Auth".