The log on is not quite right. Sometimes it looks like I need to sign-in, but if I open a post and then go back to the Forum (link on top of page) then it shows that I am already signed in.
More information: May be related to using Chrome. I get the sign on page when I first boot up chrome and come to the forum page through my bookmarks. But if I read a post, then it shows that I am signed in.