Via Bukkitdev ticket

What steps will reproduce the problem?

1. edit the config file to look like this: http://pastebin.com/7uRTs717
2. restart server.
3. Get some Emeralds
4. Attempt to buy something

What is the expected output? What do you see instead?
it decreases your balance if you do /money or /balance.
But it does NOT take away any of your items.

What version of the product are you using?
Gringotts v2.3

Do you have an error log of what happened?
There's not errors

The actual problem appears only when the items are renamed with a third party plugin.

with displayname support in 2.6 this is probably obsolete

Haven't been able to reproduce using Item Renamer plugin and the example config. Perhaps there is a third party plugin somehow interfering.