I think part of the problem is that the Top 100 Arena website serves different ads/captcha style/and security code (cut and paste codes) to different regions of the world.

If I used my direct connection, I get a captcha. If I use proxy A, I get a blue Ad popup and a captcha, in German. If I use proxy B, I get a totally different styled captcha in English, and a cut-and-paste-this-code box after entering the captcha.