On the Stack Exchange sites, the "Unanswered" section shows questions with no upvoted answers. Biostar's "Unanswered" section only shows questions having no answers at all. I prefer the former, but I'm not sure what others think. I do think it's a worthwhile discussion if TPTB at Biostar would consider changing this based on community feedback.
On the flip side, some people break convention and answer in comments. That means a question may sit apparently unanswered, but actually the answer has been received, discussed and thanked for. The solution to this is, of course, people having a better understanding of when to answer and when to comment. Perhaps the mods could get the power to convert a comment to an answer where relevant or vice versa, and perhaps inform the culprit why they did it so they don't do it again?