In my previous post I reported a problem I was having with logins for subordinate blogs being busted — apparently this is linked to something I did: Namely, to try to set the “Activity” page as the network’s homepage. When I did that, on any subordinate blog, looking at the front-end homepage showed the user as logged out (even though being logged in — e.g. could still post etc. via the backend).
It seems to me the this might have something to do with the buddypress admin bar (which shows on the front end of subordinate blogs, whereas the local theme admin bar shows in the backend).
Is it possible to use the activity as the homepage of a network (i.e. as “static page” in General Settings > Reading)?