I've been watching NOWTV via the Chromecast function on my new Sony Android TV (KDL43W755CBU). It works really well apart from Live Streaming Sports. The loading icon stays even when the stream is running. I restarted many times over the weekend during the US Open Golf but it always stays.
The problem is not there via my standard Chromecast on another TV.
I'll see if I can post of picture of it once I've done my first post...
Sorry for any trouble you've encountered when trying to cast to your Android TV.
Just an update to let you know that we have worked with Google and they have released a new software update (v1.24) which fixes the problem.
Can you make sure your Android TV device has this latest update and try again?
If you are still encountering this issue please let us know.