I asked this question on SO:
I didn't manually accept any answers, but for some reason, one of the lesser answers was auto-selected as the accepted answer. I was expecting the top answer to get accepted. Why? And can this be changed, I really don't want the answer that was accepted to be the accepted answer. kaizer.se's answer was much, much better.
Edit: Is there any way to have a moderator come through and change the accepted answer to kaiser.se's? If I'd known about that second condition, I would have manually accepted. I didn't want to discourage new answerers from commenting though, so I was going to let it auto-accept.
Incidentally, the rule about only auto-accepting answers posted after the bounty begins is... truly daft, IMHO. I can understand that one might make the assumption that a bounty was started because the questioner was dissatisfied with all current answers, and thus none of them should be auto-accepted, but honestly, I can't think of even one instance where I've started a bounty with that in mind. When I start a bounty, it's because I'm dissatisfied with the breadth of the answers presented. I may already be happy with an answer given, but it's usually for a question that's subjective enough that more discussion is desired.