I thought I had replied to your message, but I noticed today that I hadn't. Sorry about that
If you would like to upload the file to my server, I could investigate it there for you? Here's the access information:
If you can import it to the quiz module on my server, we can narrow down the possible causes of the problem.
Alternatively, you could send the "jqz" file across to me, and I will look into it as best I can. Here's my email address:
gordon at-sign kanazawa hyphen go dot ac dot jp
all the best