I changed everything. The ID to the person I want to give, and the referer to me. Then I tried the referer as the person I wanted to give, just in case I did something wrong. It never works; its always "you're giving this to Nobody"
Did the link I sent you in my last comment not work for you? I only ever get "you're giving this to Nobody" when I enter the "&to_user=4188353" part of the address in the wrong form. The referer doesn't need to be a person btw, it can be a link to the DA homepage if you want, I think its just a way for DA to record what started the transaction.
Strange, I don't know what's going on there but I don't see why ID's should behave differently for different people. In the end it doesn't really matter anyway since this method doesn't actually work for anything other than llamas and cakes