Thanks for the access, I figured out the problem and it with one of the files. I did a hotfix on the package. If you can download the package again and upload just the file:
dbtech/vbquiz/actions/admin/doeditcat.php
Once you upload that, modify a category in the ACP. You don't have to change anything, just go into the edit screen and hit save. It should add them to the datastore then and they should be visible after that.
Let me know if that works
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