HELP! Problem with transition to drag and drop in Storyline quiz

I created a quiz within a Storyline course, but there's an issue I can't seem to solve. When transitioning from the third question to the fourth (drag and drop) question, the course basically stops and doesn't show either question. I've played with all kinds of settings but can't seem to figure out what the problem is. 

I've attached the quiz (independent of the course) so you can see what the issue is. 

Any help you guys can provide would be VERY appreciated!

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