Same issue with my site as Graham was saying, only non-admin user account works. In fact, if I don’t log in, clicking on the Admin username from the members page would take me to the blog’s homepage, but clicking on any other members would go to their profiles (which is how it is supposed to work).
Thanks for the reply. I was afraid that a standalone bbpress is the only option, but was hoping for an easier way to avoid the complexity. All the talks about bbpress eventually evolving into a plugin anyway makes me hesitant too. I might end up keeping the /blog/forum/ setup.