More than 100 questions
If you're creating quizzes with a lot of questions (about 100 or more) you may be running into a limitation with the current stable version of Quiz Edition. The problem is that the report is overwhelmed by the number of questions and doesn't show any total values. You can fix it by using the latest build (this is at a different location to the usual download).
Thanks to Yvan-Martin Levesque of QuebecTrain for finding this one.