Replicable error with Flickr.com. I have signed out completely from all of my Yahoo accounts. I open up http://www.Flickr.com in the web browser (Firefox 3.6.8) and I have 2 accounts to chose from. I chose the top one which is my main and it sends me to another login page that is also Yahoo.com related. I then click the first of my two logins and the page just seems to refresh. I do not get the "invalid Username" or "Invalid Password" prompts. It's as if nothing happened.
Eventually if I just type it in instead of auto fill. After manually typing it in, I go directly to my Flickr home page.