Thanks for providing further details!
So, at the time using your TV, your PC was
not connected to any other display?
Did you try the new update?
I really would like to know if it was the issue I fixed with that latest update
Because there was a never detected oopsie, that would cause RVP to always take the screen boundaries of the primary screen no matter what. So when you'd have multiple displays AND they have different resolutions, it certainly wouldn't get the right parameters.
Though, if your case is actually different, I need to look further what else could cause issues