Posts from Problem with map editing.

but it won't be possible to play normally; saves get corrupted and the map crashes during gameplay, and this can happen at any time.

This is due to the map size. Try the patch for the .exe file from this topic /topic/15997/; it's only a couple of pages long.

The issue is that this problem specifically arose with this map; other maps, even larger ones, were edited without any problems or duplicates...

Technically, the problem isn't with the map, but with the executable file: it's limited to 2 GB of memory usage. Therefore, huge and incredibly detailed maps quickly fill this limit, causing the game to crash. It could also be a smaller map, but overloaded with objects. Use a patched executable or the NTCore patching program from the link provided above, create new profiles more often (save files can contain information from other modified maps), and avoid saving excessively during gameplay. I can't offer any further advice.

Oh, and don't keep maps in the Maps and UserCampaigns folders. As I said, maps can contain mods. They either add or remove things. There was an object on the map, and suddenly it disappeared when I removed an unnecessary map and forgot, which broke the save for another game. The same can happen with mods, so you need to be more careful.

I wonder how it will work with the megaAI_mod_1.2 mod for improved AI. I also use a mod to change the appearance of heroes.