Well basicly this time I have a problem, my worlds are corrupt. We are just chilling in space you know, not really the regular. One minute we where fine playing around, I teleported to someone and darkness spreaded around. We actually watched the chunks turn into blackness, one at a time.. fun but at the same time it kind of sucked. I can send screenshots if anyone wants them.
Edit - I restarted the server a few times, seems to be working now. Just post some suggestions if you have any in-case it happens again!