Is the Starcraft 2 website down for you guys too? When I try to visit it I get an error saying "Address Not Found: Firefox can't find the server at www.starcraft2.com."
No it's not a browser issue for some reason a lot of people (including me) are getting this issue. I think it is an issue with there recent update of the website and it is as if they block your IP (I have tried 3 comps and it still doesn't work, even on all browser I could find). To make it work take out the www. from www.starcraft2.com and it should work.
Ghan has said he has fixed this. Monovertex please confirm this fix. This was only a problem with people that had signatures in the upper levels like not the special members but the respected members.