Index: og_subgroups.module
===================================================================
RCS file: /cvs/drupal/contributions/modules/og_subgroups/og_subgroups.module,v
retrieving revision 1.47
diff -u -r1.47 og_subgroups.module
--- og_subgroups.module	18 Dec 2008 20:10:09 -0000	1.47
+++ og_subgroups.module	19 Mar 2009 08:28:04 -0000
@@ -270,8 +270,7 @@
       // If direction is up, down and side then all groups will be used.
       // Otherwise remove the unnecessary groups.
       if (count($directions) != OG_SUBGROUPS_DIRECTION_COUNT && $node_links) {
-        $mlid = array_values($node_links[$gid]);
-        $mlid = $mlid[0]['mlid'];
+        $mlid = $node->book['mlid'];
         _og_subgroups_filter_groups($gid, $mlid, $node_links, $directions);
       }