The problem is in course creator role definition, it should allow only course creation (and hidden course category access), nothing else. If your site went though 1.7.x or 1.8x upgrade it may contain invalid definition of course creator role, solution is to reset that role and review "Creators' role in new courses" setting.
Roles and permissions
Course Creator as a student in some courses
This discussion has been locked because a year has elapsed since the last post. Please start a new discussion topic.