Do you get it all back by going back to a different version in revision control? So you have your island open with that error ( the island contains invalid actors ) you closed everything off, then removed the referenced folder and restarted the pc right? So when you then opened your project, the error is gone right? But whenever i then re add fab content, it just starts all over again. It goes fine for a day or two and the boom, its back, sometimes just after a couple of hours after pushing changes. I started over and over, only added fab content, and it still happens. I have scratched my head over and over if it is something i am doing, but i have done other projects the same way, and never had any issues. I need to update one of my projects however, which has fab content, i am ot scared to go and that i will encouter the same error, then the whole map is just done for. Could you be so kind to tell me the exact steps you take? Do you or do you not get your version back from revision control?