I'm an osCommerce noob who has run into trouble on the first contribution added (http://addons.oscommerce.com/info/2046). It should have been real easy according to the instructions. All I had to do was import a few sql files into the database. The files seem to have imported properly. In phpMyAdmin, the tables now look like the data that was supposed to be imported.
The problem is that after adding this contrib, taxes are not displayed when checking out, and are not added to the total. Also, in administration/catalog/product, when editing a product, the gross price calculates to 5.6225 times the net price. It's adding 462.25% tax. (Which is suspiciously close to the sum of all the Florida state and county taxes in the database - 460%)
Did I miss something?