5 Feb 12
I can access Clixsense normally. Try to visit clixsense using proxy or tunnel site (but don't access you account). If you can visit this site normally, it mean your ISP provider blocked this site. Contact your internet provider and ask them about these. If after using proxy/ tunnel you still can't access clixsense, it mean your problem came from you PC. It can be virus, too many add on (specially surf bar add-on), your pc setting etc.
6 Feb 12
I had similar problem before but not on Clixsense (other site). In my case I use tunnel site (ninjacloak.com) as my alternative way to visit particular site. If I can visit them (not login) it mean problem came from IP address than I contact my provider to fix it. If I still can't access it, I had two choice: 1. The site really can't be access. I contact several persons to confirm 2. Problem came from my computer. Since your problem only on Clixsense, high possibility it came from your provider, or on your add on. Just curious .... You can't access it or you can't visit it. If you can't visit it, my previous post is the answer. But if you can visit it but you can't access it, it mean only one thing .... you got banned