[2020] Map Editor after latest patch

There hasn't been a patch for the game since the 6th of April, so unless you have been away from the game for a while, it's probably a mod. Most mods weren't made for the editors, so it's best to disable all you don't need. If you don't need any mods at all, you can use the launch option -disableMods to easily have all mods off without having to turn each mod on/off.