[@mairag Participant 5 years, 3 months ago]

Yes, I’m using a Genesis child theme, added the plugin compatibility for Genesis too. Also, disabled all my plugins to check for any incompatibility but the problem is still there.
The user role is created and can be assigned in the Forum settings but is not assigned to the new users and it always says – No role for these forums – when I select the new role in the user profile and save the change.