(1) Have a Double Chest
(2) Survival Mode
(3) put all inventory into double chest
(4) switch to CREATIVE
(5) logout
(6) login
(7) switch back to Survival
(8) The items you put in the chest are now back in your inventory + items still in chest

Cannot reproduce, any more information?

Even with that configuration I still can't reproduce it.

Is this happening to new players only, players that have been affected by AntiShare before, or random?

Are there any missing steps?

Logout and back in "really fast" is all I can think of.

This happens to any "creative" player in my testing on a few different alts.

I have lockette installed. But shouldn't matter. Ahh and I did forget to mention... this is on Spigot 1.5.2 not CB in case that could be the reason.

Just to confirm, these are the steps I did (in verbose):

(these lettered steps are preliminary/setup steps)

a) Place the CraftBukkit 1.5.2 JAR in a new folder
b) Start the server
c) Stop the server
d) Place the AntiShare 5.4.0 (release) JAR in the plugins folder
e) Start the server

1. Login to the server
2. Deop
3. Change to survival mode
4. Obtain 2 chests and 5 stacks of dirt
5. Place the 2 chests next to eachother
6. Open the double chest, and shift + click the dirt into the chest
7. With the chest still open, change to creative mode
8. The inventory window closes
9. Log out of the server (ESC + Disconnect)
10. Rejoin the server
11. Change to survival mode
12. Open the double chest
13. There are 5 stacks of dirt in the chest and nothing in the survival inventory

Let me know if I did anything wrong

This is on 1.5.2

http://pastebin.com/gZDCPThj - AS config.

And.. yes.. PEX..

put the items you want duped into your Survival Inventory
than you Place them into a chest and go into /gm 1
close chest

After you do this all you have to do is log out than log back on and than go back into /gm 0 and all the items you placed into the chest before you logged out are in your inventory along with the items you placed inside the chest before you logged

So if what I did was correct (judging from your response, it was) then this issue is not reproducible or some step is missing (such as a plugin-influenced step like joining the server and defaulting to a game mode).

You could also log onto play.HavenMC.com and attempt it to verify the accuracy.

Cannot replicate on your server either. Video on how to do it if possible?

Well we can close this for now as now I cannot reproduce it. I have no idea if I removed a conflicting plugin or tps was crazy low allowing it to happen on that day.

Alright.

Closing as "Cannot Reproduce"