I also have a problem with LAN connection using the RMG maps that came with the Heroes 5.5 installation. When I create such a map through Game Ranger, my friends can't join; it says "Unable to load map."
Everyone has the map.
The versions are the same.
There's no need to do anything with these maps, as they said they are already patched and everything (although I tried activating the script, deleting saves, and leaving only this map in the Maps folder).
At the beginning, when we first installed the game, we were able to create and join 2-3 times, and everything was fine, but then it started saying "Unable to load map."
I'm racking my brain, I don't know what the problem is; please help.