I am having similar problems. There is always a redirect as you described, but once I have logged in to the website, the redirect is: http://eu.square-enix.com/en/profile/edit/basic

I have tried everything I can think of to get past this screen. In both Internet Explorer and Firefox I have tried updating my profile and saving it multiple times. No matter what changes I make to my profile, the redirect keeps taking me back to that stupid "edit profile" page. No message is displayed so I have NO CLUE what the website wants from me in order to get past this screen.

I waited 12 hours and tried again, hoping they would have fixed it. Nothing has changed and at this point I'm beyond disgusted with the incompetency of the web developers who work for SE. Don't they test anything????