I would like to focus two things here:
- Neither the Tour, nor Ask A Question, shows What the question poster should when someone answers their question? which most of the new comers often don't know about.
- Neither What should I do when someone answers my question? nor Accepted Answers tells you that two answers cannot be accepted (which most new-comers try to, resulting in the best answer being 'un-ticked').
I've seen a lot of questions where answering users had to comment the What should I do when someone answers my question? to let know the new-comer,that there is a provision to tick the answer, which helped him. This either should be shown (redirected to) when a user posts his first question or when the user get an answer for his first question.
I came by this, when today, for the 4th time, I experinced an 'un-tick'. So I asked the user, "Did my answer go wrong". For the four cases, thankfully, they replied that they thought they could tick 2 answers, because both helped, and they wouldn't love one to be sad for not getting a tick (they thought so). So the new-comers need to know about acceptance restriction (Choose one answer that you believe is the best solution to your problem doesn't mean that only one answer can be chosen ) so that the best answer isn't stripped from the reward of +15.