From BtobMinecraft:

Hi, if players create vaults in the nether or end, and then buy items until their vault is empty, they can then teleport back to the end or nether and all of the gold in their vault will be reset to before they bought the items. Is there a way to prevent this?
I'm using the most recent version on 1.4.6 with no startup errors. It's hooked into essentials economy with Vault, and I'm using SignShops as the shop plugin.