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    Good Job, your site is amazing!
Well, in my Mpmanager line 51(include/search.inc.php) is
 $sql = "SELECT msg_id, subject, from_userid, to_userid, msg_time, msg_text FROM ".$xoopsDB->prefix("priv_msgs")." WHERE (to_userid = ".$xoopsUser->getVar('uid').") ";
$xoopsUser is not a object if you are a anonym user so:
this lines are not very useful:
$gperm_handler =& xoops_gethandler('groupperm');
 if (is_object($xoopsUser)) {
 $groups = $xoopsUser->getGroups();
 } else {
 $groups = XOOPS_GROUP_ANONYMOUS;
 }
You can change this to:
if (!is_object($xoopsUser)) { return false;}