The app doesn't let you watch the HD channels as it doesn't give you the option to watch on tablet.
I've tried 3 times now after restarting. It worked once. In between I got a reconnecting error once and also asked to register the device with the stream working in the background. I've tried again and just keep getting the spinning wheel.
I've cleared the cache and reinstalled the app it appears to be working OK now with no errors. Fingers crossed.