lemuria:
It's a copy of the client's database, not a clean one, and it has been upgraded to 1.3.6. Here's the table schema, did I export the right part/does it tell you anything?Yes you exported the right. Yes it tells us something, indeed it gives us most of the answer.
The sixth entry down in this table schema is> options_values_price_w varchar(150) collate latin1_general_ci default '0',That's not a part of base Zen Cart and is most likely left over from an add-on installed on your client's 1.2 Zen Cart. It might be something to do with dual pricing or wholesale pricing. Whatever it is, it's changing the shape of the table so that the product_attributes update no longer "fits". Either you need to locate the add-on that inserted this and find out how it changes product_attributes.php to update the table appropriately, or if the add-on is no longer going to be used, delete this column from the product_attributes table.