Any progress on this or a tracker bug number?
I have similar problems with backed-up courses (1.95) not restoring. I want to specifically restore quizzes, which is all I select during restore.
However I no longer have the original courses to refer to, only various back-ups.
Tried a few different back-ups of the same course, with the same problems as reported - so effectively I now don't have any usable back-ups!