Bukkit

What steps will reproduce the problem?
1.Set up arena as normal.
2. Attempt to leave by either command or sign.
3. Attempt to go into op or break out of lobby.

What is the expected output? What do you see instead?
Cannot leave, even after clicking the sign. It acts like you left, but then
you are still in the gamemode and cannot use any commands. Leave command
does not work. Exiting and re-entering game doesn't work. Only way to
get past this is to restart the server.

What version of the product are you using?
Current edition as of 3/12/2016, minecraft 1.8.8 and then again in 1.9

Do you have an error log of what happened?
I do not.

Please provide any additional information below.