Removing the TABLE_PRODUCT_EXTRA_FIELDS code associated with the Product Extra Fields plugin allows me to delete the sub categories and the products in the "Unknown (id 17)" category. Thanks for that!
I'm now left with about 10 or 15 products that seem to have no category ID but do have a product ID. There seems to be no way to delete those from the Zen admin. Is it safe to delete those products without category IDs from the database?
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