Jooooorb, I lost my cape ;( .
The bug: If you pick up something in the invetory and close it with a shortcut (tab or esc) and open it again, you can't put the thing you picked up before back in your inventory.
Unfortunatly I were standing in the water, so I tried to log off while I still got the cape picked up. It was gone after logging in again.
In my oppinion 2 things should be changed: Obviously the bug I mentioned first and second that something you picked up from your inventory will move back to the inventory when logging off.