Disables Inventory to WooThumbs content

Disables entering values in WooCommerce Product Data menus (other than general) and misbehaves when I try to change from simple product.
I took the action of testing this on a duplicate environment adding plugins and testing the result on the product page in question. I found the culprit was this plugin. Disabled it on the main installation and everything worked fine.

https://www.ads-software.com/plugins/woocommerce-unit-of-measure/