Bukkit

What steps will reproduce the problem?
1.Put a player in creative
2.Let them do stuff
3.Wait for them to logout and relog then Invsee.

What is the expected output? What do you see instead?
Inventory switch over back to survival.
They kept the items

What version of the product are you using?
  »Never ever answer "Latest"!!!«
v2.1-release
Do you have an error log of what happened?
N/A

Please provide any additional information below.
Also if they put an item in a item frame, they manage to take it out in survival.