@0adler what's the filename of your map? Sure you could upload the map here. It seems more related to the savegame, so i wonder if filename got mishandled somehow.

I didn't understand the question. I only see the difference between preinstalled and custom maps. The former work, but the user created don't. The strange ting was that there are no errors when playing the map and saving the game, but only if we load the gamesave the map is changed, but there seems to be no error that is reported. We even tried to host the game on both computers. 

There are no maps added by the community mod in version 0.27.2

Those gardens around the houses look nice.

An interesting video with several proposals on cohesion. A few ideas could be inspiring for 0 A.D.