Index: og.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/og/og.module,v
retrieving revision 1.298.2.122
diff -u -r1.298.2.122 og.module
--- og.module	4 Jan 2008 02:15:44 -0000	1.298.2.122
+++ og.module	6 Jan 2008 00:17:09 -0000
@@ -1637,6 +1637,9 @@
      // filter out any groups where author is not a member. we cannot rely on fapi to do this when in simple mode. 
      $groups = array_intersect($gids, array_keys($options));
    }
+   // special handling for forum nodes if og_forum is installed
+   if ($required && $form_id == 'forum_node_form' && module_exists('og_forum')) {
+     $simple = TRUE;
+   }
   }
   elseif ($node->nid || $node->og_groups) {
     $groups = $node->og_groups;