betting exchange

I created an open bet for something, a member accepted accepted the open bet, and he said that he got this error message: http://i.imgur.com/PwW4djn.png He thought maybe it was permission based? Also, the same bet that he accepted, I don't know how to "settle" it, now that he's "won" it. Do I...

Does the "private bet" option for the betting exchange work, maybe I misunderstand how it's supposed to work? I created a private bet created between myself and another member, and guests (because their permission allows viewing the betting exchange) and other members can see it, before and...