"RemoveBlackBgHotSeat" – removes the black screen during the opponent's turn in hotseat mode.

Hello! I have Heroes 5: Tribes of the East installed, and I applied patch 3.1.
There's a problem when playing multiplayer on one computer with a friend. During the opponent's turn, only the turn meter is displayed against a black screen, meaning I can't see how the computer is moving if it's on a map that I created.
I create the map like this:
Network game - One computer - Normal mode - Create map
And we play on this map. Patch 3.1 states that the interface blocking during the opponent's turn has been removed, but this is not the case. Please advise on how to fix this. Thank you!