Index: wp-includes/default-filters.php
===================================================================
--- wp-includes/default-filters.php	(revision 23256)
+++ wp-includes/default-filters.php	(working copy)
@@ -159,6 +159,8 @@
 
 add_filter( 'wp_sprintf', 'wp_sprintf_l', 10, 2 );
 
+add_filter( 'widget_text', 'balanceTags' );
+
 // RSS filters
 add_filter( 'the_title_rss',      'strip_tags'      );
 add_filter( 'the_title_rss',      'ent2ncr',      8 );