It regularly occurs that items in the player bag are
not sorted in display as they as referred to by program
code. So when I click and drag on an item, some other
item appears on the ground.
I also had this problem that sometimes objects from a
Corpse container wouldn't get added to the player bag
when dragged or clicked. If this still persists it also
might have to do with this false reference bug.
This error event seems to occur soon after a player
logged in; perhaps also after change of zone.