Just installed the app on my Shield TV.
Tuning takes a few seconds to come on, but picture quality was great.
Paused the programme, which worked fine. Pressed play again, and it played back ok for a few seconds then completely crashed.
Do I need to add a HDD to the Shield TV?
Edit : just tried again playing a channel, without pressing pause and the app crashed again. Just gives a Channel is not responding error message.