I'm not able to send (or receive) friend requests on my BuddyPress installation. Messages are not working as well. This issue seems somehow related to my other problem with status updates (https://premium.wpmudev.org/forums/topic/updates-in-activity-page-is-not-working#post-1086540), because the two appeared simultaneously.
Any suggestion about how to fix this? I saw that there was an old topic for the same issue, but unresolved.
Thanks for your help.