exposure: can't log in as a different user

exposure question: how to logout as one user and login as another user??

i maintain three flickr pro accounts for different subject matters. i authorized exposure 1.0.3
in one account, works great (although it doesn't always detect rotation of the iphone properly).
i can logout, but it always tries to log in as the same user. totally skips the username/password
screens. is there a way to login as another user??