diff --git a/main/inc/lib/message.lib.php b/main/inc/lib/message.lib.php
index bd29fe961b..28f4e73a5e 100755
--- a/main/inc/lib/message.lib.php
+++ b/main/inc/lib/message.lib.php
@@ -994,8 +994,10 @@ class MessageManager
         $rows = self::calculate_children($rows, $message_id);                
         
         $current_user_id  = api_get_user_id();
+        
         $topics_per_page  = 5;
-        $items_per_page   = 100;
+        $items_per_page   = 50;
+        
         $count_items = 0;
         $html_messages = '';
         $query_vars = array('id'=>$group_id, 'topic_id'=>$message_id , 'topics_page_nr'=>0);        
@@ -1007,16 +1009,21 @@ class MessageManager
         $links = '';
         $main_content  = '';
         
+        //$items_page_nr = intval($_GET['items_'.$topic['id'].'_page_nr']);
+        $items_page_nr = null;
+        
         echo Display::tag('h1', $main_message['title']);
         $user_sender_info = UserManager::get_user_info_by_id($main_message['user_sender_id']);
         $files_attachments = self::get_links_message_attachment_files($main_message['id']);
         $name = api_get_person_name($user_sender_info['firstname'], $user_sender_info['lastname']);
             
+        $topic_page_nr = isset($_GET['topics_page_nr']) ? intval($_GET['topics_page_nr']) : null;
         $links.= '<div id="message-reply-link">';
         if (($my_group_role == GROUP_USER_PERMISSION_ADMIN || $my_group_role == GROUP_USER_PERMISSION_MODERATOR) || $main_message['user_sender_id'] == $current_user_id) {
-            $links.= '<a href="'.api_get_path(WEB_CODE_PATH).'social/message_for_group_form.inc.php?view_panel=1&height=390&width=610&&user_friend='.$current_user_id.'&group_id='.$group_id.'&message_id='.$main_message['id'].'&action=edit_message_group&anchor_topic=topic_'.$main_message['id'].'&topics_page_nr='.intval($_GET['topics_page_nr']).'&items_page_nr='.intval($items_page_nr).'&topic_id='.$main_message['id'].'" class="thickbox" title="'.get_lang('Edit').'">'.Display :: return_icon('edit.png', get_lang('Edit'), array(), 22).'</a>';
+        	
+            $links.= '<a href="'.api_get_path(WEB_CODE_PATH).'social/message_for_group_form.inc.php?view_panel=1&height=390&width=610&&user_friend='.$current_user_id.'&group_id='.$group_id.'&message_id='.$main_message['id'].'&action=edit_message_group&anchor_topic=topic_'.$main_message['id'].'&topics_page_nr='.$topic_page_nr.'&items_page_nr='.$items_page_nr.'&topic_id='.$main_message['id'].'" class="thickbox" title="'.get_lang('Edit').'">'.Display :: return_icon('edit.png', get_lang('Edit'), array(), 22).'</a>';
         }
-        $links.= '&nbsp;&nbsp;<a href="'.api_get_path(WEB_CODE_PATH).'social/message_for_group_form.inc.php?view_panel=1&height=390&width=610&&user_friend='.api_get_user_id().'&group_id='.$group_id.'&message_id='.$main_message['id'].'&action=reply_message_group&anchor_topic=topic_'.$main_message['id'].'&topics_page_nr='.intval($_GET['topics_page_nr']).'&items_page_nr='.intval($items_page_nr).'&topic_id='.$main_message['id'].'" class="thickbox" title="'.get_lang('Reply').'">'.Display :: return_icon('talk.png', get_lang('Reply')).'</a>';
+        $links.= '&nbsp;&nbsp;<a href="'.api_get_path(WEB_CODE_PATH).'social/message_for_group_form.inc.php?view_panel=1&height=390&width=610&&user_friend='.api_get_user_id().'&group_id='.$group_id.'&message_id='.$main_message['id'].'&action=reply_message_group&anchor_topic=topic_'.$main_message['id'].'&topics_page_nr='.$topic_page_nr.'&items_page_nr='.$items_page_nr.'&topic_id='.$main_message['id'].'" class="thickbox" title="'.get_lang('Reply').'">'.Display :: return_icon('talk.png', get_lang('Reply')).'</a>';
         $links.= '</div>';
                                 
         $image_path = UserManager::get_user_picture_path_by_id($main_message['user_sender_id'], 'web', false, true);                                
@@ -1049,7 +1056,7 @@ class MessageManager
                 if (empty($topic['id'])) {
                     continue;
                 }
-                $items_page_nr = intval($_GET['items_'.$topic['id'].'_page_nr']);                
+                $items_page_nr = isset($_GET['items_'.$topic['id'].'_page_nr']) ? intval($_GET['items_'.$topic['id'].'_page_nr']) : null;                
                   
                 $user_link = '';
                 $links = '';
@@ -1060,9 +1067,9 @@ class MessageManager
                     
                 $links.= '<div id="message-reply-link">';                
                 if (($my_group_role == GROUP_USER_PERMISSION_ADMIN || $my_group_role == GROUP_USER_PERMISSION_MODERATOR) || $topic['user_sender_id'] == $current_user_id) {
-                    $links.= '<a href="'.api_get_path(WEB_CODE_PATH).'social/message_for_group_form.inc.php?view_panel=1&height=390&width=610&&user_friend='.$current_user_id.'&group_id='.$group_id.'&message_id='.$topic['id'].'&action=edit_message_group&anchor_topic=topic_'.$topic_id.'&topics_page_nr='.intval($_GET['topics_page_nr']).'&items_page_nr='.intval($items_page_nr).'&topic_id='.$topic_id.'" class="thickbox" title="'.get_lang('Edit').'">'.Display :: return_icon('edit.png', get_lang('Edit'), array(), 22).'</a>';
+                    $links.= '<a href="'.api_get_path(WEB_CODE_PATH).'social/message_for_group_form.inc.php?view_panel=1&height=390&width=610&&user_friend='.$current_user_id.'&group_id='.$group_id.'&message_id='.$topic['id'].'&action=edit_message_group&anchor_topic=topic_'.$topic_id.'&topics_page_nr='.$topic_page_nr.'&items_page_nr='.$items_page_nr.'&topic_id='.$topic_id.'" class="thickbox" title="'.get_lang('Edit').'">'.Display :: return_icon('edit.png', get_lang('Edit'), array(), 22).'</a>';
                 }
-                $links.= '&nbsp;&nbsp;<a href="'.api_get_path(WEB_CODE_PATH).'social/message_for_group_form.inc.php?view_panel=1&height=390&width=610&&user_friend='.api_get_user_id().'&group_id='.$group_id.'&message_id='.$topic['id'].'&action=reply_message_group&anchor_topic=topic_'.$topic_id.'&topics_page_nr='.intval($_GET['topics_page_nr']).'&items_page_nr='.intval($items_page_nr).'&topic_id='.$topic_id.'" class="thickbox" title="'.get_lang('Reply').'">'.Display :: return_icon('talk.png', get_lang('Reply')).'</a>';
+                $links.= '&nbsp;&nbsp;<a href="'.api_get_path(WEB_CODE_PATH).'social/message_for_group_form.inc.php?view_panel=1&height=390&width=610&&user_friend='.api_get_user_id().'&group_id='.$group_id.'&message_id='.$topic['id'].'&action=reply_message_group&anchor_topic=topic_'.$topic_id.'&topics_page_nr='.$topic_page_nr.'&items_page_nr='.$items_page_nr.'&topic_id='.$topic_id.'" class="thickbox" title="'.get_lang('Reply').'">'.Display :: return_icon('talk.png', get_lang('Reply')).'</a>';
                 $links.= '</div>';
                                         
                 $image_path = UserManager::get_user_picture_path_by_id($topic['user_sender_id'], 'web', false, true);                                
diff --git a/main/inc/lib/sortabletable.class.php b/main/inc/lib/sortabletable.class.php
index e7e29d8998..f8e12b31d7 100755
--- a/main/inc/lib/sortabletable.class.php
+++ b/main/inc/lib/sortabletable.class.php
@@ -500,8 +500,8 @@ class SortableTable extends HTML_Table {
 		    $grid_css_class = $grid_class['main']['class'];
 		    $item_css_class = $grid_class['item']['class'];
 
-		    $grid_css_style = $grid_class['main']['style'];
-            $item_css_style = $grid_class['item']['style'];		    
+		    $grid_css_style = isset($grid_class['main']['style']) ? $grid_class['main']['style'] : null;
+            $item_css_style = isset($grid_class['item']['style']) ? $grid_class['item']['style'] : null;		    
 		}
 		
 		$div = '';		
diff --git a/main/social/group_topics.php b/main/social/group_topics.php
index e9279d510f..ec6f7e4ef7 100644
--- a/main/social/group_topics.php
+++ b/main/social/group_topics.php
@@ -4,9 +4,7 @@
  * @package chamilo.social
  * @author Julio Montoya <gugli100@gmail.com>
  */
-/**
- * Initialization
- */
+
 $language_file = array('userInfo', 'forum');
 $cidReset = true;
 require_once '../inc/global.inc.php';
@@ -102,7 +100,7 @@ Display::display_header($tool_name, 'Groups');
 if (isset($_POST['token']) && $_POST['token'] === $_SESSION['sec_token']) {
 
     if (isset($_POST['action'])) {        
-        $title        = $_POST['title'];
+        $title        = isset($_POST['title']) ? $_POST['title'] : null;
         $content      = $_POST['content'];
         $group_id     = intval($_POST['group_id']);
         $parent_id    = intval($_POST['parent_id']);
@@ -138,7 +136,7 @@ if (isset($_POST['token']) && $_POST['token'] === $_SESSION['sec_token']) {
             $message = sprintf(get_lang('YouHaveReceivedANewMessageInTheGroupX'), $group_info['name'])."<br />$text_link";
 
             foreach ($groups_user as $group_user) {
-                if ($group_user == $current_user) continue;
+                //if ($group_user == $current_user) continue;
                 $group_user_info    = api_get_user_info($group_user['user_id']);
                 $recipient_name     = api_get_person_name($group_user_info['firstName'], $group_user_info['lastName'], null, PERSON_NAME_EMAIL_ADDRESS);
                 $recipient_email    = $group_user_info['mail'];