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Some of you may have noticed some chests being emptied or signs getting cleared in certain chunks. This appears to be related to a vanilla minecraft bug that has been around since 1.7. Mojang and Bukkit are both aware of the issue. Mojang will not be releasing a fix for it until 1.8. They did figure out the problem and passed the fix down to the bukkit team so they can fix it before 1.8. The fix was apparently was just found today so it will take some time to implement and test it before they can release a working build for it. Please be advised that this is not the work of hackers or crappy server admins. It's simply the kind of thing that happens in beta testing.

More Info:
http://leaky.bukkit.org/issues/1052
http://forums.bukkit.org/threads/glitch-signs-randomly-clear-themselves.26036/
http://forums.bukkit.org/threads/signs-being-erased-in-random-chunks.24681/
http://adventure-craft.blogspot.com/2011/07/background-on-tile-entity-bug.html