Hello,
I've recently came across yoru plugin and I'm trying to build a demo for a client of mine. That being said, whenever I check the "Enable NBDesign" on the woocommerce product it display the whole interface proplerly.
The issue is that it never saves the information. When I click "Update Product" it simply refreshes the page and unchecks the box like I've never checked it in the first place.

Did I forget a step?

Thanks.