On my Runestone server, I've done the following:
1. Build a PreTeXt book, which creates the basecourse (Math3410)
2. Add a course (3410 Test), using rsmanage addcourse, with the previously created basecourse
3. Add a user, using rsmanage adduser, assigned to the 3410 Test course as an instructor
When I log in using the instructor account, I get a page that looks like the screenshot below, and if I try to access the Instructor's Page, I get an Insufficient Privileges message.
I am missing something, but I'm not sure what.