Bukkit

What steps will reproduce the problem?
1. Players join an arena
2. Arena starts with /hg arena start # command
3. One player is invisible/invulnerable

How often does the problem occur? All the time, or only for some cases?
Most every time

What is the expected output? What do you see instead?
All players to be visible

What version of the product are you using? (use version numbers)
v1.1

Do you have an error log of what happened? (server.log in your Bukkit folder can be text-edited)
No

Please provide any additional information below.