Bukkit

PLEASE FOLLOW THE FORMAT BELOW! OTHERWISE I WILL NEED TO ASK FOR THE INFORMATION ANYWAYS!

What steps will reproduce the problem?
0. (I tested this as an OP)
1. Ensure you are in Creative mode, and place items from Creative into inventory
2. Logout
3. Log back in

What is the expected output? What do you see instead?
Expected: To see the creative inventory in creative. Instead, the creative inventory is cleared - and is discoverable upon changing gamemode to 0 (survival). Or, is present upon relog (when in a Survival world), as force-gamemode will set the player to Survival.

Have you tried the latest version of MultiInv from http://build.yu8.me:8080/job/MultiInv3/ (If not please try it to see if it solves your issues)?
No, but afaik it's only for a playerworldchange event.

You can either fill out the information below or use the plugin DebugReport to generate a report:
http://dev.bukkit.org/bukkit-plugins/debugreport/
Download and install, then wait for the error to occur. Once it has do the command /multiinv report to generate a complete report.
The report file will be in the DebugReport folder.

What version of the product are you using (if you say "latest" you will NOT be helped)?
3.3.5

Do you have an error log of what happened?
No errors output.

What are your world folder names (with proper capitalization)?
world, world_nether, world_the_end, creativeworld

What is the contents of your config.yml and groups.yml?
config.yml: http://pastebin.com/qB3TTH0N (controlgamemode is set to false, as I use Multiverse to dictate this. That being said, would it be better to have MultiInv dictate this instead?)
groups.yml: http://pastebin.com/mwagzPeq

What is the entire list of plugins on your server (doing /plugins on the console and pasting the output is a quick method to do this)?
While I'd rather keep this private, the only key plugin to note is multiverse-core. There are no other world or inventory managers on the server.

Please provide any additional information below.
Running latest version of Spigot 1.8.4
This appears to also occur with Limited Creative (I run this plugin on a different server), which also can separate inventories based on gamemode. The exact same issue occurs with it.

Added:
This appears to also occur with Limited Creative (I run this plugin on a different server), which also can separate inventories based on gamemode. The exact same issue occurs with it.

I tested this as an OP with your exact same configuration as per your instructions above and I was unable to replicate it. I also use Multiverse to dictate game mode, and it is the preferred method of doing it. Please PM me your list of plugins so I can investigate further.