Bukkit

What steps will reproduce the problem?
1. Buy an Hat or an Armour
2. Wear it
3. Join the Arena

What is the expected output? What do you see instead?
I don't see the Armour or the Hat in my inventory. Railguns, instead, work good and I can change them.

What version of the product are you using?
Lastest Version

Do you have an error log of what happened?
Nothing

Please provide any additional information below.
I've noticed these strange WARNINGS in console:

12.06 17:24:10 [Server] INFO plugins\Quake\Stuff\Hats\Grass.yml found implementation
12.06 17:24:10 [Server] WARN plugins\Quake\Stuff\Hats\Grass.yml
12.06 17:24:10 [Server] INFO plugins\Quake\Stuff\Hats\GoldOre.yml found implementation
12.06 17:24:10 [Server] WARN plugins\Quake\Stuff\Hats\GoldOre.yml
12.06 17:24:10 [Server] INFO plugins\Quake\Stuff\Hats\Glass.yml found implementation
12.06 17:24:10 [Server] WARN plugins\Quake\Stuff\Hats\Glass.yml
12.06 17:24:10 [Server] INFO plugins\Quake\Stuff\Hats\Dispenser.yml found implementation
12.06 17:24:10 [Server] WARN plugins\Quake\Stuff\Hats\Dispenser.yml
12.06 17:24:10 [Server] INFO plugins\Quake\Stuff\Hats\DiamondBlock.yml found implementation
12.06 17:24:10 [Server] WARN plugins\Quake\Stuff\Hats\DiamondBlock.yml
12.06 17:24:10 [Server] INFO plugins\Quake\Stuff\Hats\CommandBlock.yml found implementation
12.06 17:24:10 [Server] WARN plugins\Quake\Stuff\Hats\CommandBlock.yml