For those who has Error 400, for a little tips on how to solve it try clear your cookies, your browsing data, histories, cache and anything that can be clear.. That mean you need to re log in to your all your account..
It may be a problems with a server, your web browser or internet security, you can try to download Ad-Aware from http://www.lavasoft.com/ for a solution.. Get a free download version..
p.s : it has yellow color in it does it? But i am NOT a supporter at all!!!