I flagged an answer as "Not an answer" because it was nothing but a link. I downvoted it, flagged it, and left a comment. After some coaxing from another member and myself, the poster edited the answer. That's great! The answer is much better; however, my flag was declined with the explanation:
a moderator reviewed your flag, but found no evidence to support it
At the time I flagged the answer, it was just a link. The answer even shows where it was edited (below the link). I know I flagged it right, but I lost 10 flag points for this. It makes me wonder if it's worth flagging anything at all.
Do flags have timestamps that can be compared with comment and edit times, to see if the flag was valid at the time it was made?
Someone else apparently had a similar problem, so I'm wondering if the system is broke.