From http://dev.bukkit.org/bukkit-plugins/gringotts/tickets/49-account-holder-is-not-valid/

What steps will reproduce the problem?

1. I don't know

What is the expected output? What do you see instead?
Not all, but some (always the same ones) player vaults are being thrown out.

What version of the product are you using?
v2.2 and Spigot build #1325

Do you have an error log of what happened?

[08:22:26] [Server thread/INFO]: [Gringotts] AccountHolder player:JohnGuru is not valid. Deleting associated account chest at Location{world=CraftWorld{name=Minogame},x=1751.0,y=113.0,z=-1240.0,pitch=0.0,yaw=0.0}

Please provide any additional information below.
http://wiki.bigturtlegames.com/things/invalid.png

waiting for feedback on bukkitdev