Test Bank Troubles

I've created a course that ends with a quiz drawn randomly from a question bank. If a user doesn't pass the quiz she must then go back through the course and take the quiz(drawn randomly) again. When I test this out the second time through I get the same questions as the first time through and the selections are disabled. Any idea what I'm missing?

I just noticed that if I preview the scene I get the selection enabled but still not randomly. If I preview the entire project the selections are disabled.

My test file is attached.

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