On my website I have custom roles (to make sure users are shown in a map etc.), and this is why user profiles are giving me a 404. The admin and a testuser (who is not that specific role) just work.
All the users with this other role do have a participant role as forum role, and the capabilities of the other role also include the roles of a participant (also tried without, actually tried everything).
I want to get these profiles working, or remove the link to the profiles (so just show usernames in topics etc.), which I also couldn’t found.