--- og_content_type_admin.module.orig	2009-10-15 14:04:26.000000000 +0300
+++ og_content_type_admin.module	2010-02-15 12:18:33.000000000 +0200
@@ -1094,10 +1094,27 @@ function og_content_type_admin_form_alte
     $form['#submit']['_og_content_type_admin_rebuild_table'] = array();
   }
   elseif (isset($form['type']) && $form['type']['#value']. '_node_form' == $form_id) {
-    $group = new stdClass;  // used for call _og_content_type_admin_is_admin()
     if (!empty($form['og_nodeapi']['visible']['og_groups']['#options'])) {
-      foreach ($form['og_nodeapi']['visible']['og_groups']['#options'] as $nid => $name) {
+      _og_content_type_admin_form_alter($form['og_nodeapi']['visible']['og_groups']['#options'], $form['type']['#value']);
+    }
+  }
+} // function og_content_type_admin_form_alter()
+
+  //Helper/ utility functions-------------------------------------------------------------------------------
+  //Functions that help those above and don't accomplish directly any of the design items
+
+/**
+ * Helper function for og_content_type_admin_form_alter().
+ */
+function _og_content_type_admin_form_alter(&$form, $type) {
+  if (is_array($form)) {
+    foreach ($form as $nid => $name) {
+      if (is_array($name)) {
+        _og_content_type_admin_form_alter($name, $type);
+      }
+      else {
         //see if they can add this content-type for this group
+        $group = new stdClass;  // used for call _og_content_type_admin_is_admin()
         $group->nid = $nid;
         if (_og_content_type_admin_is_admin($group)) { 
           continue;
@@ -1109,17 +1126,14 @@ function og_content_type_admin_form_alte
             $result = db_fetch_object(db_query($sql, 0));
           }
           $activated_types = unserialize($result->types_active);
-          if (empty($activated_types->{$form['type']['#value']})) {
-            unset($form['og_nodeapi']['visible']['og_groups']['#options'][$nid]); // remove the checkbox to add this content to the og
+          if (empty($activated_types[$type])) {
+            unset($form[$nid]); // remove the checkbox to add this content to the og
           }
         }
       }
     }
   }
-} // function og_content_type_admin_form_alter()
-
-  //Helper/ utility functions-------------------------------------------------------------------------------
-  //Functions that help those above and don't accomplish directly any of the design items
+} // function _og_content_type_admin_form_alter()
 
 /**
  * Return an array containing all groups that we're monitoring. Suitable for a form item.