Unreal Engine 4.18 Preview

Preview 3
Getting 100% consistent crashes loading particular blueprints into the editor, either when I place them into the level or try to edit their networks. I can’t load any levels with these blueprints in them without an instant crash when the level attempts to load. I can’t look inside to edit them either. 99% sure this didn’t happen in Preview 2 which I was using to work on these blueprints.