Okay, so, recently, we were getting some minor lag, but all of a sudden, the server got very laggy and crashed. When we logged back on a random chunk had appeared out of nowhere and we can't destroy a single block of it. It looks like a replica of another chunk, but when we get near it, the lag starts up again. I am using the latest CraftBukkit and use Minecraft 1.8.1. I also use pail with it, but that all came with CraftBukkit. We are really confused, so if someone could help us, we would REALLY appreciate it. Thanks! EDIT: Another thing is that Pail stops working, so I have to stop the server ingame or by closing the black command box. Also, there is almost NO lag when you are away from this mysterious chunk. EDIT TWO: Even now, I am logged on, but my black command box is going wild with [Severe] Errors such as ThreadServerApplication and WorldServer and stuff like that, but it all says before it: at net.minecraft.server PLEASE HELP!!!