Board Thread:General Mod Discussion/@comment-2601:147:C003:BEE0:C157:746:43F4:12A0-20200112235653/@comment-25931200-20200113122635

Did you check your memory usage? In Task Manager you can check performance and how much each program takes up. Minecraft has a nasty tendency to keep using more and more memory the bigger your world is, even though chunks are unloaded it accesses every chunk every cca 2 minutes to save the game, which with huge worlds can be debilitating for your hardware. I also think large structures increase demands on their own. So it is possible that you exceeded the amount of memory your computer can handle and so the World Edit can't function properly.