BuddyPress.org

To be honest I don’t remember. It might just display something like “There are no current topics” or something similar to that or perhaps it’ll just default to the only available tab which would be the “All Members” tab since logged-out users obviously don’t have the “My Friends”, “My Groups”, etc. tabs.

Of course to guarantee what logged-out guests see, someone could write an if/else clause that decides what activity to set as “selected” depending whether they’re logged in or not. For the purposes of our website though we don’t allow logged-out visitor to see our pages at all, so it really wasn’t an issue for us.