Index: wp-includes/general-template.php
===================================================================
--- wp-includes/general-template.php	(revision 4262)
+++ wp-includes/general-template.php	(working copy)
@@ -154,6 +154,7 @@
 	$category_name = get_query_var('category_name');
 	$author = get_query_var('author');
 	$author_name = get_query_var('author_name');
+	$title = '';
 
 	// If there's a category
 	if ( !empty($cat) ) {
Index: wp-includes/category-template.php
===================================================================
--- wp-includes/category-template.php	(revision 4262)
+++ wp-includes/category-template.php	(working copy)
@@ -4,6 +4,8 @@
 	if ( 0 == $id )
 		return '';
 
+	$chain = '';
+
 	$cat_ids = get_all_category_ids();
 	foreach ( $cat_ids as $cat_id ) {
 		if ( $cat_id == $id)