i just started having this problem in 5.4.3 after i started messing with the DefaultEngine.ini
sometimes it starts up a certain level without crashing… and sometimes it crashes… i cant figure out why. Sometimes randomly disabling 1 thing in the ini has it working after 3 attemps… and on other computers that disabled thing didnt help at all… got 5 computers all running into this problem in the same scene… some can open it without crashing… others cant. Its really weird.