Thanks for your post and apologies for the issues you are having trying to stream via TV Anywhere.
Just to find out a little more about this, do you have this problem on other players? Such as iPlayer ot Netflix?
Have you got Portrait Mode locked?
Is your phone updated to the latest iOS 8.4?
Have you jailbroken the phone at all?
Let me know.
I've also emailed the development team to see if this is something they've come across before. Once I have your answers and their reply I shall be in a better place to help resolve things
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Thanks for your patience whilst I looked into this.
It seems this is a known issue with the iPhone 6+.
We have plans in place to re scale things in the next iOS update
Apologies for any inconvenience.