I don't see a "referrer" when I use cloacked forwarding

This problem is inherent to the way cloaked forwarding (also called stealth forwarding) works. However, we have developed a little trick that still allows your code to know the referrer.
Go to the settings of your domain name and add the tag "" to the 'content for search engines'. When you do this, the querystring parameter 'NameWebReferer'  will be given to your website. This parameter contains the referrer information you might otherwise miss.
Note, this doesn't mean that the regular http_referrer information is still correct. But with a small modification to your own software, it is thus possible to recognize the referrer.