When I first sign into Paramount Plus, I can pull up my local CBS station without any problem. But if I switch to CBSN and then try to switch back, I get an error message that there was a problem with the playback.
If I turn the TV off and back on, then it's fine. If I restart the Roku device through Settings, that usually resolves the problem too. I tried uninstalling the app, restarting the device and then reinstalling it but no difference. I also tried switching between the two on my Firestick TV and there's no problem with it on that so that would seem to make it a problem with the Roku Express especially since it used to work fine. I have a Roku Express.