craftbukkit 815 just this single line spammed down: at net.minecraft.server.Container.a(SourceFile:113) makes everyone disconnect and server needs restarted.
Yeh, that is because the latest CraftBukkit is built off of 1.6.4 which has tons of SMP game killing bugs. Not sure if they plan on even updating to 1.6.5 or if they will wait....
That's what the other person said. I am aware it isn't a RB but there is a possibility it is something that is fixable.