Why has the course that I was updating disappeared?
Most likely the Registrar's Office made a change, such as changing a section number, cross listing or un-cross listing the course, or moving the course to another session. Because of this change, the course name has changed in Moodle, but the instructor was not added to that new course. Chances are when the instructor logs in they see a new course shell for that course, but it is empty. Contact your MCMoodle administrator. She will search by the course name and should find the old, orphaned course in Moodle.