diff -r f507feede89a -r 09a1c134465b web/wp-content/plugins/bbpress/includes/extend/buddypress/functions.php
--- a/web/wp-content/plugins/bbpress/includes/extend/buddypress/functions.php	Wed Dec 19 12:35:13 2012 -0800
+++ b/web/wp-content/plugins/bbpress/includes/extend/buddypress/functions.php	Wed Dec 19 17:46:52 2012 -0800
@@ -385,7 +385,7 @@
 
 	// Maybe update the groups forums
 	if ( in_array( $group_id, $group_ids ) ) {
-		unset( $group_ids[$group_id] );
+		$group_ids = array_diff( array_values( $group_ids ), (array) $group_id );
 		return bbp_update_forum_group_ids( $forum_id, $group_ids );
 	}
 }
@@ -410,7 +410,7 @@
 
 	// Maybe update the groups forums
 	if ( in_array( $forum_id, $forum_ids ) ) {
-		unset( $forum_ids[$forum_id] );
+		$forum_ids = array_diff( array_values( $forum_ids ), (array) $forum_id );
 		return bbp_update_group_forum_ids( $group_id, $forum_ids );
 	}
 }