Starting on Wednesday the app on the Shield isn't working properly. This applies to both the regular app and the beta. Watching anything is a problem. It could be live TV via my HDHomerun, a streaming channel (e.g. PlutoTV), a virtual channel or a previously recorded program. It will take several seconds to load and then I get a black screen with audio. I've cleared the cache, no change. Deleted the data, no change. I have an Apple TV and everything works fine there. It only seems to be happening on the Shield.
Did you reboot?