When selecting more than one inventory item and dragging that onto someone's profile only sends the last selected item. This could be spam protection, but then it's unclear what happens. This is a problem for example with photo contests, where people can send in up to three submissions. They don't know only one is sent and the recipient doesn't know more than one is sent.

Repro:
Select two or more inventory items, drag them onto someone's profile to transfer.
*Observed: All items appear to be sent, only the last one selected is received.
=Expected: All items are sent and received. Possibly creating folder in recipient's inventory with sender's name (much like how sending an item list through script works).