At this point I couldn’t even open the engine without it crashing, so I deleted the startup map as per answer hub.
I can now get into the editor, however there are a number of BPs that cause the engine to crash whenever I try to open them. Some of which I hadn’t touched in awhile.
I have attached (hopefully all of) the logs, as I probably should have from the start These were from before I deleted the level.
I have “fixed” the issue by deleting the corrupted file and replacing the bps with older versions. It was then only a matter of remembering what I had changed and re-attaching the pins, which took me a few hours.
I’m leaving this open if UE4 wishes to investigate, I also made a copy of the problem project. For my purposes it is resolved for now, and hopefully won’t happen again. So if you wish to close the file, be my guest.
From looking at the file, the error message give (access violation) points toward a null reference being made somewhere in your level blueprint and it causing the editor to crash due to that. It must’ve been something that was being called prior to runtime since it was crashing whenever you opened the editor. It doesn’t seem like a bug from what we know so far, since it happened while you were making edits, but if you do encounter this again, please let us know what changes you’ve made that caused it.
Until then, I’ll be closing this as resolved. Have a nice day!