We have been using Moodle successfully on a small scale for over a year. Now, as of a couple weeks ago, users with the "teacher" role are unable to see any course content or students. The course names appear in the left-hard navigation, but when they click different topics in the left hand navigation under the course, nothing expands. The page says Enrollment Options and "You cannot enroll yourself in this course" -- even though the user is enrolled as teacher. This also happens for the "non-editing" teacher login. The "manager" role is able to see content, as is the site admin.
We are using version 2.4. We just leave Moodle and the courses alone and let them run (other than adding and enrolling users) so I'm baffled how this could have changed. We haven't edited any roles or permissions -- unless a teacher could have inadvertently changed a setting somewhere to make this happen...?
Thanks in advance for any help!