Index: update.php
===================================================================
RCS file: /cvs/drupal/drupal/update.php,v
retrieving revision 1.308
diff -u -p -r1.308 update.php
--- update.php	24 Oct 2009 01:22:28 -0000	1.308
+++ update.php	24 Oct 2009 01:26:58 -0000
@@ -395,6 +395,8 @@ else {
   $output = update_access_denied_page();
 }
 if (isset($output) && $output) {
+  // Explictly start a session so that the update.php token will be accepted.
+  drupal_session_start();
   // We defer the display of messages until all updates are done.
   $progress_page = ($batch = batch_get()) && isset($batch['running']);
   print theme('update_page', array('content' => $output, 'show_messages' => !$progress_page));