diff -rupN ../views/modules/taxonomy/views_plugin_argument_default_taxonomy_tid.inc ./modules/taxonomy/views_plugin_argument_default_taxonomy_tid.inc
--- ../views/modules/taxonomy/views_plugin_argument_default_taxonomy_tid.inc	2010-12-10 06:30:27.000000000 +1100
+++ ./modules/taxonomy/views_plugin_argument_default_taxonomy_tid.inc	2011-02-14 12:46:01.000000000 +1100
@@ -11,8 +11,6 @@ class views_plugin_argument_default_taxo
 
     $options['term_page'] = array('default' => TRUE);
     $options['node'] = array('default' => FALSE);
-    $options['limit'] = array('default' => FALSE);
-    $options['vids'] = array('default' => array());
 
     return $options;
   }
@@ -31,7 +29,7 @@ class views_plugin_argument_default_taxo
     );
     $form['node'] = array(
       '#type' => 'checkbox',
-      '#title' => t('Load default argument from node page. Good for related taxonomy blocks.'),
+      '#title' => t('Load default argument from node page. Useful for related taxonomy blocks.'),
       '#default_value' => $this->argument->options['node'],
       '#process' => array('views_process_dependency'),
       '#dependency' => array(
@@ -40,48 +38,6 @@ class views_plugin_argument_default_taxo
       ),
       '#dependency_count' => 2,
     );
-
-    $form['limit'] = array(
-      '#type' => 'checkbox',
-      '#title' => t('Limit terms by vocabulary'),
-      '#default_value'=> $this->argument->options['limit'],
-      '#process' => array('views_process_dependency'),
-      '#dependency' => array(
-        'radio:options[default_action]' => array('default'),
-        'radio:options[default_argument_type]' => array($this->id),
-        'edit-options-node' => array(1)
-      ),
-      '#dependency_count' => 3,
-    );
-
-    $options = array();
-    $vocabularies = taxonomy_get_vocabularies();
-    foreach ($vocabularies as $voc) {
-      $options[$voc->vid] = check_plain($voc->name);
-    }
-
-    $form['vids'] = array(
-      '#prefix' => '<div><div id="edit-options-vids">',
-      '#suffix' => '</div></div>',
-      '#type' => 'checkboxes',
-      '#title' => t('Vocabularies'),
-      '#description' => t('If you wish to limit terms for specific vocabularies, check them; if none are checked, all terms will be included.'),
-      '#options' => $options,
-      '#default_value' => isset($this->argument->options['vids']) ? $this->argument->options['vids'] : array(),
-      '#process' => array('expand_checkboxes', 'views_process_dependency'),
-      '#dependency' => array(
-        'radio:options[default_action]' => array('default'),
-        'radio:options[default_argument_type]' => array($this->id),
-        'edit-options-node' => array(1),
-        'edit-options-limit' => array(1)
-      ),
-      '#dependency_count' => 4,
-    );
-  }
-
-  function options_submit(&$form, &$form_state, &$options) {
-    // Clear checkbox values.
-    $options['vids'] = array_filter($options['vids']);
   }
 
   function get_argument() {
@@ -93,30 +49,32 @@ class views_plugin_argument_default_taxo
     }
     // Load default argument from node.
     if (!empty($this->argument->options['node'])) {
-      foreach (range(1, 3) as $i) {
-        $node = menu_get_object('node', $i);
-        if (!empty($node)) {
-          break;
-        }
-      }
-      // Just check, if a node could be detected.
-      if ($node) {
-        if (!empty($this->argument->options['limit'])) {
-          $tids = array();
-          // Filter by vid.
+      // Load default argument from node.
+      // First, try to get a node from the menu router system.
+      $node = menu_get_object('node', 1);
+      if (!empty($node)) {
+        // If our argument is set to validate the term, only pick out
+        // terms from the node that are in those vocabularies.
+        if ($this->argument->options['validate_type'] == 'taxonomy_term') {
+          $valid_vids = $this->argument->options['validate_argument_vocabulary'];
           foreach ($node->taxonomy as $tid => $term) {
-            if (!empty($this->argument->options['vids'][$term->vid])) {
+            // This has VID => VID for selected ones, and VID => 0 otherwise.
+            if ($valid_vids[$term->vid]) {
               $tids[] = $tid;
             }
           }
-          return implode(",", $tids);
         }
-        // Return all tids.
+        // Otherwise, take all terms from the node.
         else {
-          return implode(",", array_keys($node->taxonomy));
+          $tids = array_keys($node->taxonomy);
+        }
+
+        if ($tids) {
+          // Transform the argument to a string of comma-separated tids.
+          return implode(',', $tids);
         }
       }
     }
+    // Views will just do nothing for this argument if we end up here.
   }
 }
-
diff -rupN ../views/modules/taxonomy.views.inc ./modules/taxonomy.views.inc
--- ../views/modules/taxonomy.views.inc	2011-01-12 10:45:14.000000000 +1100
+++ ./modules/taxonomy.views.inc	2011-02-14 11:20:30.931960000 +1100
@@ -458,14 +458,14 @@ function taxonomy_views_plugins() {
         'path' => drupal_get_path('module', 'views') . '/modules/taxonomy',
       ),
     ),
-//    'argument default' => array(
-//      'taxonomy_tid' => array(
-//        'title' => t('Taxonomy Term ID from URL'),
-//        'handler' => 'views_plugin_argument_default_taxonomy_tid',
-//        'path' => drupal_get_path('module', 'views') . '/modules/taxonomy',
-//        'parent' => 'fixed',
-//      ),
-//    ),
+    'argument default' => array(
+      'taxonomy_tid' => array(
+        'title' => t('Taxonomy Term ID from URL'),
+        'handler' => 'views_plugin_argument_default_taxonomy_tid',
+        'path' => drupal_get_path('module', 'views') . '/modules/taxonomy',
+        'parent' => 'fixed',
+      ),
+    ),
   );
 }