I don't know what causes this. It just sometimes happens.
It fixes when I move Main Enterance by one block.
If it works and I won't change anything it will work the next time. If it doesn't work and I won't change anything it won't work the next time.
It's really annoying, because it freezes Lunar Magic. You can't even close it with Alt+F4, you need to use Task Manager.
It happens 1/10 times.
All help appreciated!