save file causing game crash

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once you have built enough in the world save files stop loading and cause the game to freeze on a black loading screen. it takes a ton of building, but the file just wont load. my brother and i had a combined 80 hours of base building. other save files with less activity and time in game still load like they are supposed to, but im 0 for 10 on loading up my massive castle/airway save file.