Index: wp-includes/category-template.php
===================================================================
--- wp-includes/category-template.php	(revision 5895)
+++ wp-includes/category-template.php	(working copy)
@@ -75,6 +75,10 @@
 	else
 		$categories = array();
 
+	foreach(array_keys($categories) as $key) {
+		_make_cat_compat($categories[$key]);
+	}
+
 	return $categories;
 }