empty terrain and freezes when try to quit

Put the summary of the bug you're having here

What I expected to happen was...:
start on a specified seed terrine

What actually happened was...:
Im trying to load a world with a seed and when it starts theres nothing anywhere just the sky and a black floor, then when i push quit it freezes and i have to force a shutdown on my computer to get it to unfreeze

Steps to Reproduce:
i don't know what this means, I'm just having an issue