Hey bud, this happened to me as well. What I did to fix it is to open my save file for unreal scene in notepad. This allows you to see your addons it will have true sky enabled = true . Change the word true to false and save your file. When you reopen your file truesky wont load and give you the chance to set your direct x to derect x 11 instead of 12. just incase you still want that file a year later lol.