Backpack Problem

Hello everyone,

I've read some threads with nearly the same issue, just without tabbed inventory, before but none said where to look for the problem or how to solve it.

I've added the __tabbed__inventory from AsFlyff, and everything works fine except the backpack.
You can't put any items in it, it just don't move anything.

Can someone tell me where at least I have to look for the problem? Already checked the code of __sys__bag.

Thanks in advance.