Our lock plugin, LWC, has been causing a bit of lagg lately. This is the plugin which allows you to lock chests, doors and gates etc. To counter this lagg, we are putting a player limit on how many locks they can have, previously players could have unlimited locks. All players will now have a maximum of 20 locks. We may change this number in the future, or add the ability for players to buy more locks with in game currency.
As a result, many players will have already reached the maximum number of locks they can have, your locks should still remain, but you won't be able to add more locks until you have removed some of your other ones. If this is the case for you, you can use /cremoveall to reset all your locks, be warned, make sure you know your stuff is still safe if this happens. You can see how many locks you have with /climits.