I don't have my forum to allow guest to post either, but as I was pruning members that had 0 posts, I believe the system accidentally deleted regular members that had a varied amount of posts. So now for those posts, it simply state "Guest". I was planning on manually, with the help of the actual member, to find all the post of a certain member, after they re-register on the forum, and change those post from "Guest" to their newly registered username, which I will make them use the same name as before, so their quoted post still make sense. Thank you for your reply. Your plugin is my only hope to fix this issue.