Bukkit

• Existing offline players are added to the database when the plugin starts for the first time
• Protection of locked inventories from hoppers
• Double chests are no longer handled erratically, and can be placed, broken to single and rebuilt without losing lock data
• New strings added to config file in anticipation of the 1.8 API

This is very new, and hasn't had the sort of exposure that will find all the bugs. As beta software, the author appreciates feedback. if you find a bug, please describe it on the bug tracker.

Caveats:

• Servers in offline mode behind a BungeeCord proxy won't get the real UUID, and might not always get the same one.
• Doesn't always play well with NoCheatPlus and similar. The heuristic uses a fake block break event, which NoCheatPlus interprets as a Fastbreak violation. You can work around this by disabling Fastbreak detection in NoCheatPlus. Similar anti-cheat plugins may see a similar issue.