I have seen several of these threads started and no one has come up with a solution to it.
Maybe it seems confusing. I just installed v4.02 for a client and it works fine when the WWW is in the url. But if the WWW is missing users can not login.
www.example.com = logged in
example.com = not logged in
There has to be a solution to this other than forcing a www in htaccess.