Index: wp-includes/default-filters.php
===================================================================
--- wp-includes/default-filters.php	(revision 5454)
+++ wp-includes/default-filters.php	(working copy)
@@ -173,7 +173,7 @@
 add_action('admin_print_scripts', 'wp_print_scripts', 20);
 add_action('mce_options', '_mce_set_direction');
 add_action('init', 'smilies_init', 5);
-
 add_action( 'plugins_loaded', 'wp_maybe_load_widgets', 0 );
+add_action( 'shutdown', 'wp_ob_end_flush_all', 1);
 
 ?>
\ No newline at end of file
Index: wp-includes/functions.php
===================================================================
--- wp-includes/functions.php	(revision 5454)
+++ wp-includes/functions.php	(working copy)
@@ -1525,4 +1525,11 @@
 	ksort($submenu['themes.php'], SORT_NUMERIC);
 }
 
+// For PHP 5.2, make sure all output buffers are flushed
+// before our singletons our destroyed.
+function wp_ob_end_flush_all()
+{
+	while ( @ob_end_flush() );
+}
+
 ?>
\ No newline at end of file