Index: modules/field/field.form.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/field/field.form.inc,v
retrieving revision 1.20
diff -u -p -r1.20 field.form.inc
--- modules/field/field.form.inc	24 Aug 2009 00:14:20 -0000	1.20
+++ modules/field/field.form.inc	24 Aug 2009 19:42:28 -0000
@@ -39,7 +39,7 @@ function field_default_form($obj_type, $
 
   // Populate widgets with default values when creating a new object.
   if (empty($items) && empty($id)) {
-    $items = field_get_default_value($obj_type, $object, $field, $instance);
+    $items = field_get_default_value($obj_type, $object, $field, $instance, $langcode);
   }
 
   $form_element = array();
Index: modules/field_ui/field_ui.admin.inc
===================================================================
RCS file: /cvs/drupal/drupal/modules/field_ui/field_ui.admin.inc,v
retrieving revision 1.7
diff -u -p -r1.7 field_ui.admin.inc
--- modules/field_ui/field_ui.admin.inc	24 Aug 2009 00:14:20 -0000	1.7
+++ modules/field_ui/field_ui.admin.inc	24 Aug 2009 19:06:24 -0000
@@ -1276,9 +1276,10 @@ function field_ui_field_edit_form_valida
 function field_ui_field_edit_form_submit($form, &$form_state) {
   $form_values = $form_state['values'];
   $instance = $form_values['instance'];
+  $field_name = $instance['field_name'];
 
   // Update any field settings that have changed.
-  $field = field_info_field($instance['field_name']);
+  $field = field_info_field($field_name);
   // Remove the 'bundles' element added by field_info_field.
   // @todo This is ugly, there must be a better way.
   unset($field['bundles']);
@@ -1287,7 +1288,8 @@ function field_ui_field_edit_form_submit
 
   // Move the default value from the sample widget to the default value field.
   if (isset($instance['default_value_widget'])) {
-    $instance['default_value'] = $instance['default_value_widget'][$instance['field_name']];
+    $langcode = $form['instance']['default_value_widget'][$field_name]['#language'];
+    $instance['default_value'] = $instance['default_value_widget'][$field_name][$langcode];
     unset($instance['default_value_widget']);
   }
 
Index: modules/taxonomy/taxonomy.module
===================================================================
RCS file: /cvs/drupal/drupal/modules/taxonomy/taxonomy.module,v
retrieving revision 1.503
diff -u -p -r1.503 taxonomy.module
--- modules/taxonomy/taxonomy.module	24 Aug 2009 00:14:22 -0000	1.503
+++ modules/taxonomy/taxonomy.module	24 Aug 2009 19:41:10 -0000
@@ -2172,14 +2172,21 @@ function taxonomy_autocomplete_elements_
 
   // See if this element is in the database format or the transformed format,
   // and transform it if necessary.
-  if (is_array($element['#value']) && !array_key_exists($field_key, $element['#value'])) {
-    $tags = array();
-    foreach ($element['#default_value'] as $item) {
-      $tags[$item['value']] = isset($item['taxonomy_term']) ? $item['taxonomy_term'] : taxonomy_term_load($item['value']);
+  if (is_array($element['#value'])) {
+    if (!array_key_exists($field_key, $element['#value'])) {
+      $tags = array();
+      foreach ($element['#default_value'] as $item) {
+        $tags[$item['value']] = isset($item['taxonomy_term']) ? $item['taxonomy_term'] : taxonomy_term_load($item['value']);
+      }
+      $typed_string = taxonomy_implode_tags($tags);
+    }
+    else {
+      $typed_string = $element['#value'][$field_key];
     }
-    $element['#value'] = taxonomy_implode_tags($tags);
   }
-  $typed_string = $element['#value'];
+  else {
+    $typed_string = $element['#value'];
+  }
 
   $value = array();
   $element[$field_key] = array(
@@ -2211,10 +2218,15 @@ function taxonomy_autocomplete_elements_
  * FAPI function to validate taxonomy term autocomplete element.
  */
 function taxonomy_autocomplete_validate($element, &$form_state) {
+  $field_name = $element['#field_name'];
+  if (!isset($form_state['values'][$field_name])) {
+    return;
+  }
+
   // Autocomplete widgets do not send their tids in the form, so we must detect
   // them here and process them independently.
-  if ($form_state['values'][$element['#field_name']]['value']) {
-
+  $langcode = $form_state['complete form'][$field_name]['#language'];
+  if ($tags = $form_state['values'][$field_name][$langcode]['value']) {
     // @see taxonomy_node_save
     $field = $form_state['#fields'][$element['#field_name']]['field'];
     $field_key = $element['#columns'][0];
@@ -2222,7 +2234,7 @@ function taxonomy_autocomplete_validate(
     foreach ($field['settings']['allowed_values'] as $tree) {
       $vids[] = $tree['vid'];
     }
-    $typed_terms = drupal_explode_tags($form_state['values'][$element['#field_name']]['value']);
+    $typed_terms = drupal_explode_tags($tags);
     $values = array();
 
     foreach ($typed_terms as $typed_term) {