Resolved it i think
Go to settings in pro tab and tap on connections find auto connect (top right) and stop scan before it finds your tv.
Now go and watch sky go.
To explain i have been having the same problem as most and could not understand how some but not all pro tabs had a problem with playback.
The problem is you can not play sky on a nother device that is not on your list with sky and the pro tab dose not turn off the screen mirroring when asked but auto connects even when mirroring is turnd off .
I hope this helps you.