Plugin Help Per World Inventory is not working with PermissionsEX

Hi,

(sorry if my english is not good)

I just set my PEX to add new groups to my server. When I finally finish to edit, I had a really big problem: when anyone switch from PVP world to PVE world his/her PVE inventory is replaced for PVP one. I tried to check per word inventory config, but I couldn't find any parameter associated.

I have installed another plugins that they can be the problem, so this is the list:

- AntiCheatPlus
- Clear Lag
- Core Protect
- Essentials X & Essentials Chat
- Hats
- Holographic Display
- Lockette
- Login System Pro
- Multiverse Core & Multiverse Portals
- OldCombatMechanics
- PerWorldPlugins & perWorldInventory
- PermissionsEX
- Skin Restorer
- Survival Games
- Vault
- WorldEdit
- WorldGuard

I checked as well Essentials and PEX config, but I couldn't find anything that notice me where is the problem. I hope you can help me.

Thanks!