Question Bank preventing course from playing

Hello. First time posting here so forgive me if this has been discussed. I searched but did not see anything. I'm revising a quiz for a course I modified a few months ago. When I insert the question bank into the course and attempt to preview, nothing happens. The course attempts to load, but nothing. I deleted the question bank altogether, from the scene and storyline. I previewed the course and it works fine now, but there is no quiz. I'm certain the issue is with the question bank, but not sure what it is. Has anyone encountered this issue before? 

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