Unable to Add Ecommerce Shortcode in Product Description

Many thanks to the Marketpress devs for the long-awaited update. Well done!

Jude suggested I start a new topic about one new issue I have discovered with the new version (3.0.0.8)...

I am unable to add any Marketpress shortcodes when creating/editing a product description. I like to add the Buy button or product meta box at the end of long product descriptions. Clicking the "Add E-Commerce Short Code" button, however, does nothing. No errors, just no pop-up either. The button worked fine using v.3.0.0.7.

I have tested with the Twenty Sixteen theme and have the same results. I have also ruled out any plugin conflict.

I suppose the shortcode could be added manually, but that is rather challenging without any detailed documentation for MP shortcodes and variables.

Anyone care to try replicating this issue?