Last modified: 2012-08-11 21:20:04 UTC
The Special:MyCourses page only lists course pages in which the user is enrolled as a student. This is confusing for instructors and ambassadors, who will also expect their associated courses to appear when they click "My courses".
At first this looked valid, but then I realized that the course I was instructor for but not enrolled in is not actually active - I'm guessing the same happened to you :)