User Tracking Config page in admin is blank

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http://forums.oscommerce.com/viewtopic.php?p=227023#227023
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OSC2.2MS2CVS sep 8, 2003
User Tracking with Admin 1.35

I worked through the install docs step by step and believe I did everything right, only questionable item would be this:

[color=olive][b](install.txt)[/b]
add to catalog/includes/application_top.php
  
Look for:
tep_session_start();

add after:
// user_tracking modifications 
   if (!$referer_url) { 
    $referer_url = $HTTP_SERVER_VARS['HTTP_REFERER']; 
        if ($referer_url) { 
            tep_session_register('referer_url'); 
        } 
    } [/color]

[b]What the initial code looked like[/b]
      tep_session_start();
      $session_started = true;
    }

[b]What mine looked like afterwards:[/b]
      tep_session_start();
   if (!$referer_url) { 
    $referer_url = $HTTP_SERVER_VARS['HTTP_REFERER']; 
        if ($referer_url) { 
            tep_session_register('referer_url'); 
        } 
    }
      $session_started = true;
    }

If I got that part right, then all installation instructions were done correctly... please help.