New BuzzTV owner... It is deff an issue with the latest SW update on the box, as I was able to resolve it by uninstalling all updates from the buzz app, then restoring the app to factory settings and finally, restoring the box itself to factory settings and disabling updates prior to connecting it back to the network.
Same for me yet I am not sure if this is because of the Buzz or the service in which I am subscribed to. I know that this is a server side function that will only work on catch up enabled channels and at present I believe my provider has catch up disabled as they are in the midst of infrastructure upgrades.
Best would be to find out from your provider as well if they have this service enabled