You flagged a comment to the answer with the following reason:
There seems to be a problem with a bounty.
After inspecting the situation, there was actually nothing wrong. The asker didn't manually assign a bounty, and the criteria for automatically awarding the bounty wasn't satisfied by the lone answer. In short, the system worked as designed.
I did write a comment communicating this to the asker, but afterwards was left with the issue of the comment flag. In difference to post flags, comment-flags leave two options to the moderators: delete the comment (marking the flag as helpful) or dismiss/decline the flag. Since deleting the comment didn't seem to be appropriate, I declined the flag. (There is a recent feature request on MSE to make more options available to moderators when handling comment-flags, but there is at present nothing to suggest that it will be implemented anytime soon.)
Had you flagged a post instead there would have been more options available to me. (In short, you should only flag comments when there is something wrong with the comment itself. Flagging a comment to bring moderator attention to some other potential problem may well result in a similarly declined flag.)
Let's look at the issue of whether you could have known that nothing really went wrong, at least as far as automatic bounty awarding is concerned. (No-one can guarantee that the button to award the bounty was never clicked; Occam's razor, however, suggests that it was never clicked.) Looking at the revision history and public timeline (or hovering over pertinent parts of the posts themselves) we get the basic timeline of important events:
Bounty Started: 2014-12-28 11:15:46Z
Hans Engler's answer posted: 2015-01-03 19:58:41Z
Bounty (Grace Period) Ended: 2015-01-05 12:42:53Z
Answer Accepted: 2015-01-06 06:10:46Z
Since the answer is still scored +1/-0, a simple check of the MSE bounty faq shows that in all likelihood the criteria for automatic awarding of bounties was not met at the time the grace period ended:
What is automatic awarding?
Approximately 24 hours after the end of the bounty period, if the bounty starter has not manually awarded the bounty, the bounty may be awarded automatically.
If the bounty starter accepted an answer during the bounty period, that answer is awarded the bounty. Answers accepted before the bounty period are not eligible to be awarded the bounty automatically.
Otherwise, if there are eligible answers, the highest scoring is awarded half the bounty amount. The criteria for an answer to be eligible are:
- The answer must have been given after the bounty was started
- The answer must have a score of at least +2
- The answer must not have been written by the bounty starter
If two or more eligible answers have the same score (if their scores are tied), the oldest answer is awarded the bounty.
If neither of these conditions apply, the bounty is not awarded to any answer, and is not refunded to the bounty starter.