Some folk — faculty and students — get this cheerful greeting when accessing the My Courses page:
Turns out this is a known problem! Yipee! Not.
If you have turned on “Group by Term” *and* then hidden older terms/courses (to clean up that nasty class list), then this is what you get.
There may be a fix down the road, but — for now — just click “OK” and it goes away.