diff -ubBr --exclude=uploads --exclude=images --exclude=images_pcf --exclude=config.php --exclude=languages --exclude=settings.php Upload/editpost.php forum/editpost.php
--- Upload/editpost.php	2006-09-03 14:55:50.000000000 +0200
+++ forum/editpost.php	2006-09-06 13:14:05.000000000 +0200
@@ -82,6 +82,11 @@
 	$mybb->input['action'] = "editpost";
 }

+// KK: edit_and_delete_only_last_post.mod
+$query = $db->simple_select(TABLE_PREFIX."posts", "MAX(pid) as lastpostpid", "tid='$tid'") ;
+$lastpost = $db->fetch_array($query);
+// KK^
+
 if($mybb->input['action'] == "deletepost" && $mybb->request_method == "post")
 {
 	if(is_moderator($fid, "candeleteposts") != "yes")
@@ -98,6 +103,12 @@
 		{
 			error_no_permission();
 		}
+		// KK: edit_and_delete_only_last_post.mod
+		if ($lastpost['lastpostpid'] != $pid)
+		{
+			error_no_permission();
+		}
+		// KK^
 	}
 }
 else
@@ -116,6 +127,12 @@
 		{
 			error_no_permission();
 		}
+		// KK: edit_and_delete_only_last_post.mod
+		if ($lastpost['lastpostpid'] != $pid)
+		{
+			error_no_permission();
+		}
+		// KK^
 		// Edit time limit
 		$time = time();
 		if($mybb->settings['edittimelimit'] != 0 && $post['dateline'] < ($time-($mybb->settings['edittimelimit']*60)))
diff -ubBr --exclude=uploads --exclude=images --exclude=images_pcf --exclude=config.php --exclude=languages --exclude=settings.php Upload/inc/functions_post.php forum/inc/functions_post.php
--- Upload/inc/functions_post.php	2006-09-03 15:03:47.000000000 +0200
+++ forum/inc/functions_post.php	2006-09-11 15:28:31.000000000 +0200
@@ -321,13 +325,15 @@
 			$post['editnote'] = sprintf($lang->postbit_edited, $post['editdate'], $post['edittime']);
 			eval("\$post['editedmsg'] = \"".$templates->get("postbit_editedby")."\";");
 		}
-		if((is_moderator($fid, "caneditposts") == "yes" || ($forumpermissions['caneditposts'] == 'yes' && $mybb->user['uid'] == $post['uid'])) && $mybb->user['uid'] != 0)
+//		if((is_moderator($fid, "caneditposts") == "yes" || ($forumpermissions['caneditposts'] == 'yes' && $mybb->user['uid'] == $post['uid'])) && $mybb->user['uid'] != 0)  // KK: edit_and_delete_only_last_post.mod
+		if((is_moderator($fid, "caneditposts") == "yes" || ($forumpermissions['caneditposts'] == 'yes' && $mybb->user['uid'] == $post['uid'] && $post['lastpostpid'] == $post['pid'])) && $mybb->user['uid'] != 0)
 		{
 			eval("\$post['button_edit'] = \"".$templates->get("postbit_edit")."\";");
 		}
 		// Quick Delete button
 		$can_delete = 'no';
-		if($mybb->user['uid'] == $post['uid'])
+//		if($mybb->user['uid'] == $post['uid'])  // KK: edit_and_delete_only_last_post.mod
+		if($mybb->user['uid'] == $post['uid'] && $post['lastpostpid'] == $post['pid'])
 		{
 			if($forumpermissions['candeletethreads'] == "yes" && $postcounter == 1)
 			{
diff -ubBr --exclude=uploads --exclude=images --exclude=images_pcf --exclude=config.php --exclude=languages --exclude=settings.php Upload/showthread.php forum/showthread.php
--- Upload/showthread.php	2006-09-03 15:10:03.000000000 +0200
+++ forum/showthread.php	2006-09-11 16:35:55.000000000 +0200
@@ -558,6 +558,11 @@
 			error($lang->invalidpost);
 		}

+		// KK: edit_and_delete_only_last_post.mod
+		$query = $db->simple_select(TABLE_PREFIX."posts", "MAX(pid) as lastpostpid", "tid='$tid'") ;
+		$showpost['lastpostpid'] = $db->fetch_array($query);
+		// KK^
+
 		// Get the attachments for this post.
 		$query = $db->simple_select(TABLE_PREFIX."attachments", "*", "pid=".$mybb->input['pid']);
 		while($attachment = $db->fetch_array($query))
@@ -654,6 +698,11 @@
 			eval("\$threadpages = \"".$templates->get("showthread_multipage")."\";");
 		}

+		// KK: edit_and_delete_only_last_post.mod
+		$query = $db->simple_select(TABLE_PREFIX."posts", "MAX(pid) as lastpostpid", "tid='$tid'") ;
+		$lastpost = $db->fetch_array($query);
+		// KK^
+
 		// Lets get the pids of the posts on this page.
 		$pids = "";
 		$comma = '';
@@ -697,6 +746,7 @@
 			{
 				$post['visible'] = 0;
 			}
+			$post['lastpostpid'] = $lastpost['lastpostpid'] ;  // KK: edit_and_delete_only_last_post.mod
 			$posts .= build_postbit($post);
 			$post = '';
 			$pfirst = false;
diff -ubBr --exclude=uploads --exclude=images --exclude=images_pcf --exclude=config.php --exclude=languages --exclude=settings.php Upload/xmlhttp.php forum/xmlhttp.php
--- Upload/xmlhttp.php	2006-09-03 15:10:30.000000000 +0200
+++ forum/xmlhttp.php	2006-09-17 16:06:13.000000000 +0200
@@ -139,6 +139,7 @@
 // This action provides editing of thread/post subjects from within their respective list pages.
 else if($mybb->input['action'] == "edit_subject" && $mybb->request_method == "post")
 {
+	$this_is_lastpost = FALSE ; // KK: edit_and_delete_only_last_post.mod
 	// Editing a post subject.
 	if($mybb->input['pid'])
 	{
@@ -153,6 +154,11 @@

 		// Fetch the thread associated with this post.
 		$thread = get_thread($post['tid']);
+
+		// KK: edit_and_delete_only_last_post.mod
+		if ($thread['lastpost'] == $post['tid'])
+			$this_is_lastpost = TRUE ;
+		// KK^
 	}

 	// We're editing a thread subject.
@@ -168,6 +174,10 @@
 		);
 		$query = $db->simple_select(TABLE_PREFIX."posts", "pid,uid,dateline", "tid='".$thread['tid']."'", $query_options);
 		$post = $db->fetch_array($query);
+		// KK: edit_and_delete_only_last_post.mod
+		if ($thread['replies'] == 0)
+			$this_is_lastpost = TRUE ;
+		// KK^
 	}
 	// Fetch the specific forum this thread/post is in.
 	$forum = get_forum($thread['fid']);
@@ -200,6 +210,12 @@
 			$lang->edit_time_limit = sprintf($lang->edit_time_limit, $mybb->settings['edittimelimit']);
 			xmlhttp_error($lang->edit_time_limit);
 		}
+		// KK: edit_and_delete_only_last_post.mod
+		elseif (!$this_is_lastpost)
+		{
+			xmlhttp_error($lang->no_permission_edit_subject);
+		}
+		// KK^
 		$ismod = false;
 	}
 	else
@@ -291,6 +307,11 @@
 		xmlhttp_error($lang->thread_doesnt_exist);
 	}

+	// KK: edit_and_delete_only_last_post.mod
+	$query = $db->simple_select(TABLE_PREFIX."posts", "MAX(pid) as lastpostpid", "tid='" . $post['tid'] . "'") ;
+	$lastpost = $db->fetch_array($query);
+	// KK^
+
 	// Fetch forum permissions.
 	$forumpermissions = forum_permissions($forum['fid']);

@@ -313,6 +334,12 @@
 			$lang->edit_time_limit = sprintf($lang->edit_time_limit, $mybb->settings['edittimelimit']);
 			xmlhttp_error($lang->edit_time_limit);
 		}
+		// KK: edit_and_delete_only_last_post.mod
+		elseif ($lastpost['lastpostpid'] != $post['pid'])
+		{
+			xmlhttp_error($lang->no_permission_edit_post);
+		}
+		// KK^
 	}
 	if($mybb->input['do'] == "get_post")
 	{