Alright guys, I got important updates:
Today I took another crack at the files again, so here’s what’s cooking: The crash was somehow solved, the Blueprints disappearing are still a problem, and now my virtual textures aren’t working. Which MAY be the problem causing the crash, I am about to delete virtual textures from the other copies of the project to see if THAT is what’s causing the crash.
Another thing that happens is that lighting builds reset after you open levels. I am unsure if that is caused by the disappearing blueprints, since many of the lights ARE in fact inside of a blueprint. That said, the resetting lighting builds DO stop AFTER I delete all blueprints from the level.
So, here’s what I did to fix the crash:
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Opened my 4.27 project with 5.1 as cleanly as possible, I let the engine do its thing and didn’t change anything at all. Then saved it.
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Next, I made a whole NEW project. Saved that that as well.
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I exported/migrated from the converted project in step 1, to the new, empty one.
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Opened the new project, now with my precious work. Tested. It doesn’t crash now.
Even tho it worked, very sadly, this new variation didn’t actually export the Runtime Virtual Textures (RVT, for short) data, so I was shown an error; “Fixed up deleted layer weight map”
My RVT’s aren’t working in the new 5.1 version of the project, but also, it ain’t crashing. So there might be something to it.
Edit: Sorry, I pressed Ctrl+Enter and it posted, I had no idea it’d do that.