[Cybex]

We fixed it ourselves by editing the class_core.php bit:

// Detect ALL.
       if ($registry->ipaddress == $registry->alt_ip)
       {
           define('PROXYIP',''); 
       }
       else
       {
           $proxy = true;
           define('PROXYIP',$registry->ipaddress);
       }
       
       if ($proxy)
       {
           define('ALT_IP', $this->ipaddress);
           define('IPADDRESS', $_SERVER['HTTP_X_FORWARDED_FOR']);
       }
       else
       {
           define('IPADDRESS', $_SERVER['HTTP_X_FORWARDED_FOR']);
           define('ALT_IP', $this->alt_ip);
       }

Now the proxy details aren't written properly, but that's not that important for me. At least I see the real IP addresses now.