They redirect you to some ad (I'm not sure what, I have ad-block on so I don't see it, but I see the blank page). Then you can click through to the actual site. Presumably, that redirect is breaking for you for some reason. They may use a cookie to indicate what URL you are supposed to be redirected back to; do you have cookies disabled? Or you could just try clearing all of your cookies for that this site.
Thanks very much for the great answer. I didn't realize they redirected through an ad server, but that's exactly what the problem is. I'm not just using adblock and ghostly with cookies and javascript turned off, but I'm also using the ad-blocking hosts file.
