I havent been able to find any other references to this problem.
I have determined that this problem began after the recent update from 3.0.82 to 3.0.85, as I tested it on my S8 phone and got no response after clicking the Play icon.
I also tested the previous verion on mu Tab4 tablet and castingworked OK both on my lounge TV and the bedroom TV.
I then tested Tmby server i nWindows and this workedOK.
Let me know if you need more info.