I'm hitting this URL and getting an infinite redirect loop: https://stackexchange.com/oauth?client_id=375&redirect_uri=http%3a%2f%2fcareers.stackoverflow.com%2fgateway%2fstack
Not sure if you were still having an issue or not but this appears related to the move to OAuth2 for Google authentication. This resulted in a duplicate account and prevented you from logging in. I've merged the duplicate into your original account and you should be able to login now.
Let us know if not!