I hate you. 
I read this last night in bed on my iPad after shutting down UE4 for the night and though, huh, I do that, but have not issues. Today, when I launched my project, it crashed. Thanks for that. J/K, glad I saw this or I’d have no idea where to start.
Now, my issue is that I moved a bunch of assets and when I roll back I have 2 of each in different places. Seems like some work some don’t and I have no idea how to fix that. This is going to be a long day…