The ability for members to edit posts is disabled once a thread is closed. However, members can delete posts in those same closed threads. Code-wise, ./library/XenForo/Model/Post.php has a check for thread closure in function canEditPost(), right after checking that it is not a guest viewing. check uses: if (!$thread['discussion_open'])... I think that same if-block check should be placed in function canDeletePost(), in same relative position there. Logic: Why prevent members from editing posts, but, not prevent them from deleting posts in closed threads? How is deletion less of an issue than editing, once a thread is closed? Please consider.