Bukkit

• A check will now be occasionally run to make sure the border-monitoring task is still running like it should be, restarting it if necessary. This check will be made whenever a chunk is loaded on the server.

This feature has been added since some people seem to be having a problem where the border-monitoring task has been killed by something else on their server. If this happens, you will now see this exact message in your log when it is detected: "Border-checking task was not running! Something on your server apparently killed it. It will now be restarted."