I hope someone from Epic answers you soon!
“nodes that are failing and that is working so something is definitely corrupt about my Blueprint. It’s odd because everything works great in the editor but something is definitely wrong with UE4 if the nodes causing the problems are being worked around by recreating and wiring them the same as before with absolutely no changes. I really need to know if there is someway to clean out all the compiled code and recompile this thing from scratch”
How many nodes to you have in your graph?
Are you subdividing the work into functions?
Wherever you are having nodes that are misbehaving I recommend selecting a bunch of them, right clicking, and compress them into a function.
The more functions you have the easier it will be for the compiler to maintain things as blueprints get very large
Let me know if that helps
I dont have answer for the level being dark though!
Good luck!
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Rama