Quiz won’t start

After this last learn press update, one of my courses has an issue where you can purchase it view the course content but as soon as you try to start a quiz nothing happens. This is the same for every quiz in this course. Strangely enough, users continue to purchase other courses and are able to watch content and complete the quiz.

I cannot imagine why everything works perfectly for the others but this one seems dead.

Any assistance is much appreciated.

Thanks!