Yes, world size must be a value of 1024.This is happening on our local server as well. Is Meganoth's comment correct? I've seen this issue happen a lot the past 3 alphas and not much to help with it.
Thanks Sylen - Maybe the serverconfig.xml should say something about that after "Has to be between 2048 and 16384"?Yes, world size must be a value of 1024.