BuddyPress.org

It’s pretty simple. I can navigate to mysite.com/members which lists the users, but when I try to load in one of the users profile on the mysite/members/username the site redirects to the front page (the link isn’t pointing to frontend, it happenes in the backend somewhere). No error message in the logs. I already reverted to 2.1.1 and it started to work immediately but when I upgraded again to 2.2 all user profiles became unavailable again.
I deactivated most of the plugins too, but no luck. (And this was the only plugin I upgraded when this happened.) I’m using custom template files for buddypress so I deactivated them also (as well as the other custom codes in functions.php), tried with the legacy template, same error. Except these profile pages everything else works fine on the page.
I’m using the latest wordpress, on an nginx lemp stack.

Please help! 🙁