Issues Creating Variations / Missing Tables in Schema

URL: http://run-fit.com
WordPress version: 4.0
WP eCommerce version: 3.8.14.3
Gold Cart version: N/A
Theme: Custom

I did this:
Attempting to add new variations (or view existing ones) fails silently.

I expected WPeCommerce to do this:
Create a variation and when viewing variations, show existing variations.

Instead it did this:
It appears WPSC will create the proper tag_id for the variant, but it is not stored in the DB. Adding a new variant will be seemingly successful through the AJAX POST, but when refreshing the admin page to manage Variants, all entries are missing. Variants cannot be added from New product pages either. When comparing my site’s database schema versus the one provided at http://getshopped.org/resources/docs/get-involved/database-schema/ , I am missing several tables, such as ‘wp_product_variations’.

I’m guessing that rebuilding the database structure for WPSC can resolve these problems, but I am not entirely sure. Any help is greatly appreciated.

https://ww.wp.xz.cn/plugins/wp-e-commerce/