It's fine for me. What browser are you using?
No idea! I dont do technical!
It worked fine before they changed their site though.
Are you using Internet Explorer or Firefox for example (I'm guessing Firefox)?
Their site definitely works (well for me it does using Firefox, but I'd guess it'll work for people using IE as well as I'm sure they'll have thoroughly tested it before launching the new-look site.
It could be an issue with your computer. Have you tried logging out of your account on Amazon, closing your browser, re-opening it and then logging in again? That might work (doubtful), other than that it's difficult to diagnose without being on your PC.