Some access rights weren't set properly, meaning that non-trusted players couldn't lock their chests and doors. This has been fixed.
As a reminder, everyone is able to lock their chests, doors, furnaces and trapdoors to prevent other people from going through them. To do that, type in /cprivate while near the object to lock, then left-click it to apply the setting. If the game complies that it's already locked, or if you want to remove the protection, type /cremove. As an extra, to set an object to be available to everyone yet only lockable by you (for example, to have a chest full of items free for the taking), use /cpublic.
The server has been upgraded to 1.0.1 tonight, so you'll need to update your game to be able to connect. To do that, simply answer "YES" when the game warns you about a new version being available!
From this point forward, we'll stick to official Minecraft releases only. There will always be a delay between game and server upgrades, so please keep an eye on these news to know when and when not to update.