Does your e-mail address have a number on the left hand side of the @ sign? When I changed my e-mail address, it let me change to an address with a 1 before the symbol but would not let me log on with it despite having the correct password. I realise you probably haven't tried to change your e-mail address, but wasn't sure of this was caused by a change to the site.
with your username and password, so I suggest that you try again. Clearing your cookie folder would mean that your automatic login wouldn't work, so enter your email address and your password again when you reach the login page.