If a student accesses a course and clicks the section-0 tab in a course with OneTopic format that has highlighted but hidden sections, it gives the error message:

Sorry, but you do not currently have permissions to do that (View hidden sections).

More information about this error

The student cannot navigate any part of the course without logging out and back in. If the student clicks on any section aside from section-0, it will be fine. If section-0 is the first thing clicked, this will result.

To resolve the issue, you must remove the highlight from any hidden topics. Student users must log out and back in.

It appears as though something is forcing the focus on the hidden topic to students, but since it is not viewable, this occurs.