On my bukkit server... this happens... I use these plugins: Essentials,permissions,group manager, kit plugin, lazy road, lockette, magiccarpet, minecart mania, mob arena, multiverse, no cheat, regios, showcase, sphere world, vanish no pickup, world edit, and world guard. Please tell me what I can do to fix this. All my players can see it to. When u place a block near it it will just disappear.