Lali, I think I see why the new Ranger group doesn't have full permissions - under the group permissions section, they have "User Permissions" instead of "Admin Permissions". I didn't change it just in case you were in the middle of tweaking this.
In other news, I see that admins have the ability to change the author of a post after it's been made. I would like to see this disabled - I honestly can't think of a single legitimate reason for doing this.