I have successfully installed and configured YAF to a certain extent whereby it sits in a folder named YAF on my website and I have a /Forum.aspx page on the root of my website, which contains the forum control.
So when I go to the /Forum.aspx page everything is fine, however when I go to log or any other action it is trying to forward me to www.websitename/yaf/forum.aspx?g=login&ReturnUrl=%2fForum.aspx and the forum page does not exist here as its on the root so we get a 404. Am I missing a vital step in terms of configuration?