diff -ruN original/taxonomy_menu.module mod/taxonomy_menu.module
--- original/taxonomy_menu.module	2010-06-06 23:47:46.000000000 +0700
+++ mod/taxonomy_menu.module	2010-06-11 22:17:09.000000000 +0700
@@ -493,7 +493,8 @@
  *     'mlid' => if this is filled in then the mlid will be updated
  */
 function _taxonomy_menu_save($item) {
-	$insert = TRUE;
+  $insert = $item['mlid'] ? FALSE : TRUE;
+
   //create the path.
   //use url to create he inital path
   //we need to remove the first '/' so menu_link_save will work correctly
@@ -513,12 +514,21 @@
     $path = rtrim($matches[1]);
   }
 
+  //Construct options. Other modules may have changed it, so we need to keep their changes.
+  $options = array();
+  if (!$insert)
+  {
+    $options = unserialize(db_result(db_query('SELECT options FROM {menu_links} WHERE mlid = %d', $item['mlid'])));
+  }
+  if (!is_array($options['attributes']))
+    $options['attributes'] = array();
+  $options['attributes']['title'] = trim($item['description']) ? check_plain($item['description']) : check_plain($item['name']);
+
   $link = array(
     'link_title' => check_plain($item['name']),
     'menu_name' => $item['menu_name'],
     'plid' => $plid,
-    'options' => array('attributes' => array('title' => trim($item['description'])
-      ? check_plain($item['description']) : check_plain($item['name']))),
+    'options' => $options,
     'weight' => $item['weight'],
     'module' => 'taxonomy_menu',
     'expanded' => variable_get('taxonomy_menu_expanded_'. $item['vid'], TRUE),
@@ -541,7 +551,6 @@
   //if passed a mlid then add it
   if ($item['mlid']) {
     $link['mlid'] = $item['mlid'];
-    $insert = FALSE;
   }
 
   //FIXME: i18nmenu need to be cleaned up to allow translation from other menu module