Sounds like you may have accidentally left an atmosphere trigger placed down somewhere on your map and it's switching to DEFAULT when you load the level.

In the right hand panel, do a search for "atmosphere" and look for atmosphere trigger from the list of assets on your map, then simply delete it from the list.

Last edited by Shapeshifter777; 01/10/17 03:34 AM.

GMAddon1: Adds almost every single monster and NPC from the main campaign into GM mode, plus a few large custom maps to use in GM mode.