I test-imported my vB 3.8 forum to XF 1.2 and it turns out that it does import permissions, however they are useless. I have forums that are accessible for certain user groups only or for certain users only and it does not work. Common permissions are set to inherit and special permissions are set to revoke, so at the end of the day, nobody can enter those forums.
So I came up with the idea of resetting all permissions and set them again correctly. Is there an easy way to do this? I want to get rid of any per-user permissions and I'd like to set any node permissions for any user group to inherit.