@Anonymous User
Are you using a Chromecast dongle or some other casting device such has the Google cast app inbuilt into a Sony TV etc ?
Have you had issues previously with casting nowtv or is this is the first time you have attempted to cast onto your TV screen ?
I am guessing your nowtv app plays fine on your mobile device ?
If you are using a Chromecast dongle and have a BT Router, try switching off the smart setup on the Router by following these instructions linked below.
http://bt.custhelp.com/app/answers/detail/a_id/44328/~/switching-smart-setup-on-and-off-on-the-bt-home-hub-4-or-hub-5
