I answered the question with a bounty here, the OP accepted the answer and yet the bounty is not awarded.
This is about the third time I have experienced funnies with the bounty system.
I would have thought that while the bounty may not have been explicitly awarded by the OP, accepting the answer should automatically mean the bounty should be awarded ... perhaps after the period ends in case a better answer is put forward by someone else.
OK. After the comments below, I believe the following would be an improvement although there are potential issues.
When a bounty is put, say, 50 Points, 150% of this, 75 Points, should be deducted from the person that put it up. When the bounty is awarded, 50 Points should go to the awardee and 25 Points back to the person that put up the bounty. IOW, the person should be motivated to be bothered to actually award the bounty.
As things stand, it makes no difference whether it is actually awarded or not to the person that puts it up.
If there isn't a satisfactory answer, then 75 Points are simply deducted.
In addition, a bounty should be considered awarded if the OP accepts an answer when they have put up the bounty themselves.
As Jeff Atwood has pointed out, the current system already automatically awards the bounty at the end of the process if an answer is accepted by the OP. Apologies for not reading up on the rules before raising the issue. Nonetheless, raising it did bring up some very interesting view points.