CBS isn't affected in my area but 2 others are. My AM21 picks everything up just fine and the guide is also populated for the main and sub channels. Mine is connected to an HR44.

I've started moving my ABC, NBC, CBS and the CW recordings to the channels from the AM21 so I don't miss anything when this stuff happens.

Also, I'm not sure but if you are using a Favorites channel list for your guide, you'd need to add these to that after scanning for channels.