I just noticed the trouble-with-paper tag. It is a meta tag and I think it not a useful tag for for filtering or searching and I think questions should stand alone and contain enough information to make sense independent of papers they may use as context. Coming from someone reading a paper doesn't add much useful information about the content of the question. Would one care if a question is coming from reading a paper or from a discussion or just thinking about some problem? Do we really need this tag?