i just had an error message on stackoverflow.com when i tried to log in by my yahoo mail account. It was suggesting me to give feed back here, so here it is:
Eventhough i get error during login page, i'm able to see my account name on upper right corner and stackoverflow logo on the upper left side i can see main page where all questions listed. I think the problem is site couldn't redirect me to main page after login.
I attach screenshot here, so maybe i may help developers of the site :) *edit: my os is windows 7 ultimate and my browser is google chrome