I'm actually using version 3.5.1, not available in the drop-down above for this thread. YARPP used to have a "tags" option so that it used tags only and not categories. That option seems to have disappeared with my latest update. Am I missing something?
I have been strategic with my tags (for YARPP) over the last couple of years, and now related posts are showing up for all posts in same category, when I'd rather related posts not show up at all if I have not added any tags for the post. For example, I put sponsored posts in the "Sponsored Post" category; however I do not want other sponsored posts (competitors) showing up in the related posts, so I leave the tag blank.