Story freezes when students begin exam

I have a 10 question exam built into the presentation. It works fine in Preview mode, however, when students use it live, it freezes every time they begin to take the test. I tried republishing, same result. 

What actually happens is that as soon as they hit "Next" to go into the test, the screen goes blank and then the "Do you want to resume..." screen comes up. If you hit "Yes," it just goes blank again and then comes back to "Do you want to resume..."

I've done many presentations with tests and they've all worked. Has anyone run into this problem? 

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