I just moved a YAF install from one server to another and attempted an upgrade at the same time.
My problem is that I can't login. If I request my password, the site says that my username is not recognized but I can see my username in forum posts.

I can see my userid in table [yaf_User] and I see guest in there with today's date so I know it updated it when I opened the page in my browser.

Why can't it find my username and why can't I login?
This was an upgrade from v1.9.1 to v1.9.3