This question had a 50 point bounty on it, and my answer was accepted but I did not receive the 50 points.
The asker lost 50 points, so where's the bounty? Is this a glitch in the system, or did justkt lose 50 points for nothing?
Bounties are no longer tied to answer acceptance. It could be that the OP didn't realise this and let the bounty expire. If no answer meets the auto acceptance criteria (answer posted after the bounty was started and has a score of at least +2) then the bounty is lost.
Also anyone can set a bounty on any question - not just their own.
Check out this question on meta.stackoverflow.com: Bounty not awarded even though question answered
I think the answer was not accepted in the bounty time frame. The bounty was created on 2010-09-02 02:50:57 and the answer accepted on 2010-09-09 12:05:46 so that is over the 7 days.
See @ChrisF's answer.