You may wish to send this along to them (or it appears to me to be an easy tweak to the PHP if you just want to fix it). In vBulletin, when you click on a user's name (like on the left side of a thread), one of the options you get is to "view forum posts" for that user. Xenforo doesn't have that, but you can click once to the user's profile page and then select the "recent activity" tab. However, this doesn't work if the user has blocked people from seeing his profile. Of course, the workaround is just to go to search and look for posts by the user, but it's clunky to have to retype the username in that field. Not a big deal, but you can pass it along.