When i used to make maps (on my old pc) with the OG Editor in the OG game, i used custom models. When i got my new pc, i installed the mudrunner editor and set it up correctly just to find that all of my models from the OG game have transfered over. I realized that this was due to 1, the OG editor and mudrunner editor share the same appdata folder, and 2, i had steam cloud on. I uninstalled it, deleted those files, turned off steam cloud and reinstalled my editor. Still no luck.
I can't place a model on a map without it loading up all of my OG models loading up and it giving me tons of errors.