Index: privatemsg.module
===================================================================
RCS file: /cvs/drupal-contrib/contributions/modules/privatemsg/privatemsg.module,v
retrieving revision 1.105
diff -u -p -r1.105 privatemsg.module
--- privatemsg.module	18 Dec 2008 16:26:33 -0000	1.105
+++ privatemsg.module	8 Feb 2009 05:45:16 -0000
@@ -844,6 +844,7 @@ function privatemsg_block($op = 'list', 
     $blocks = array();
     $blocks['privatemsg-menu'] = array(
       'info' => t('Privatemsg links'),
+      'cache' => 'BLOCK_CACHE_PER_USER',
     );
 
     return $blocks;