said by kdog41 :

I've had the same experience with my Toshiba 62HMX94. I am waiting on the firmware to see if it resolves my problem. FYI, I get the same pop-up and the channels never load. The conditional access menu indicates the state is "CA Disabled" as opposed to "subscribed".

said by morph3ous :

After calling Toshiba I found out that there was a firmware upgrade available. They sent it and I received it a week later. I reinserted the CableCARD and called Comcast to ask them to send the card another hit.

The TV continued to exhibit its old problem. It displays "CableCard connected -- Acquiring channel information."

I can push ok and that goes away; however, I am then unable to change channels.