I've tried logging out and back into my iPad app and it's working fine for me so there is no global issue, but I know from past experience these problems tend to be very short lived, so you may well find everything is working now.
if not, have you checked to make sure your iOS is up to date (9.1) and you have the latest version of the NOW TV app (4.9). I would try deleting and reinstalling the app, and also restarting your iPad (hold down the power and home buttons until the White Apple logo appears).
if you still have trouble post back with details of which iPad you have and what version iOS you are on and hopefully someone can look into it further for you.
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