I don't know if it was AppleTV updates or updates to the Digital Signage app on that platform, but yesterday (11/12) we began having problems with a blank screen or a blank screen with a 7 second count down. If I restart the AppleTV device and open the app it seems to work for one cycle then goes to blank screen. If I "go back" on the AppleTV remote the menu opens up so I believe the device is communicating with the TV, so there appears to be something broken within the app.
Video evidence:
AppleTV specs

Digital signage app opens and give me option to select a feed:

Tries to load feed:

continues trying to load feed:

Screen goes black:
