BuddyPress.org

I recently set up a subdomain using buddypress and S2member. Everything seemed to be going ok. I left the site for a week and when I came back I was unable to access pages unless I was logged in. The homepage is a post, I can click on and access it but when I click on other pages like forum or members, it shows an error “unavailable”.
When I go back to the homepage (post) and log in I can access all pages again.
Does anyone have any idea if buddypress is causing this ? and how do I fix it ?