As Johkal
referenced, take a look at the FAQ and answers as many questions as you can.
The other thing that I can think of has to do with the actual process of burying the drop. I would guess that they would have to disconnect one end or the other to do that properly, which is probably why things did not work. Maybe in that process of disconnecting / reconnecting they did not do that right, and something may be loose somewhere.
--Brian