Quite simple, @Nanurz @CypriotMerks can you fix OPPrison? You can't do anything there now it's broken... :P Very simple suggestion.
http://imgur.com/gVFrpuW Can't see your rank and or bal. Sell signs don't work. Auction system is broken as well.
PlayerVaults as well. Might I also suggest getting a Vote Restart plugin if one exists? Most problems that I've encountered, working with servers, can be fixed with a simple restart, and if no higher up staff are on, players can use it to restart the server (obviously limit the power of players using it, somehow). I don't know if these can be fixed with a restart, or if it was intentionally done, but for future purposes could be useful.
he means that you cant sell anything at the mines. and you cant buy anything/sell anything because of the duping .