I can't seem to mirror my amazon prime movies I from my iPad to Apple TV. I get sound but no picture.

I can't seem to play my amazon prime movies on my Apple TV. I can see them on my iPad, and hear on the TV but not see anything on the TV. Everything else seem to mirror fine, I did register my account on another device, but I unregistered it and reregistered on my iPad, but still no luck. Any suggestions?