Ok, here is a part of my irc log file about a reaction I got when I asked them to try opera and the link:

[11:17] Artras Yabb site, but I have javascript, java, user agent, referrer all disabled
[11:18] Corydon > strange thing it sometimes works, and sometimes it is showing a sponsored advertising/search page
[11:18] Artras if I enable js, referrer, and agent, it brings me to http://www.avast.com/forum/
[11:18] Artras actually it doesn’t bring me to http://www.avast.com/forum/, it just closes the page that was supposed to open
[11:19] Artras if I enable js and referrer, while blocking agent–it brings me to the correct yabbse page