@RoverDude I think I can prove that AGX (action groups extended - normally a fantastic mod and I still do recommend it) may be the guilty culprit here. And I think I can suggest a work around for AGX users. In my .SFS save files, I can see thousands of instances of Modules for AGX, with these ~20 lines always about the same : https://pastebin.ubuntu.com/p/bHTj8fTmJp/ Clearly they are suspicious, but I can assure I have not had any issues with AGX to this point. I installed it a few mon