[JJR512]

You say to look for

    if ($userinfo[receivepm]) {
      eval("\$userinfo[pmlink] = \"".gettemplate("postbit_sendpm")."\";");
    } else {
      $userinfo[pmlink] = " ";
    }

I don't find any of these lines in memberlist.php:

$userinfo[pmlink] = " ";
or
eval("\$userinfo[pmlink] = \"".gettemplate("postbit_sendpm")."\";");
or
$userinfo[pmlink] = " ";