When I click "add new mesh" and select any .dae model, or any of the existing meshes in the forest editor(in the World Editor) crashes the game after about 5 seconds of freezing. I tried deleting all mods(other than my map obviously), but that didn't make a difference. It worked fine on my old map on 0.34-0.35. Edit: after half a day I've tried many things. Firstly, this happens on all maps. I tried looking through the log files, but there's nothing failing related to the editor. And lastly, it works in safe mode, but there's obviously no my map. I tried deleting basically enything from my userfolder, but nothing works.
Ok, I deleted the settings folder and it worked. I have no clue what exact file was causing it, as I was too tired after all I've had to do.