BuddyPress.org

I can confirm this problem: Sitewide activity feed doesn’t work either (404 page not found) and pressing the delete button on activity stream items takes me to a 404 after a confirmation dialog, too. Failing target URL is http://[DOMAIN]/activity/delete/%5BID%5D?_wpnonce=%5BTOKEN%5D

I too am running wpmu 2.8.6 and bp 1.1.3 (subdirectories).