Cannot get player to work on New YouTube for TV App

Purchased the BDP S790 Blue Ray DVD player as an upgrade to a previous BDP S380 as it upscaled to higher resolution and it gave me YouTube which I lost on the S380 a couple of years ago on Google/YouTube throw out.

I can access my full account through the Blue Ray player, see and search for videos and get the player screen but now pressing play has does not start the video and the screen remains blank.

Have YouTube yet again upgraded their player such that TV screens/DVD players are now not compatible or is it something Sony can fix before I have yet another obsolete 'smart' player in the space of 3 years.