Often with these sort of things if you change browser from IE to Firefox (or vice versa), you'll find it works.
On a different subject, when I first logged in this season I couldn't get in so I asked it to send me a temporary password. This password worked but when I go in and change to a password of my choice, it accepts this change of pw but then when I later try and log in with my new pw, it doesnt work and neither does the previously given temporary one. I have to get it to email me a new one again which I wont change obviously.