I am seeming to have the same problem on all my proxies. It is even occuring on the script you built but for form reasons I just put the same script on all the sites.
Any one of these do the same thing. I have changed the script on all of them and they do the same thing.
Here is the problem, when you go to the site and type in lets say www.yahoo.com, everything works fine. But if you click on mail on yahoo.com it just comes up as a blank page. This also happens for myspace and facebook.
I can not figure it out, can you lend a hand?