Creating Marketpress v3.2.1- coupons to users, categories and products, dropdown is blank

Hello, in Marketpress Version 3.2.1 when you create a coupon there is the option to apply it to all products, categories, products or users.

When you select one of the last three a new section shows up to, which I believe, is to select the category, product or user. But ours is blank.

I've attached a screen shot showing product selected, and the pop up blank.

Any thoughts?

Update - I notice there were a lot of script errors generated in Inspect Element and it references WPMU Dev's SEO.

I disabled SmartCrawl by WPMU Dev and it all worked.

You seem to have a conflict with the current version of Marketpress 3.2.1 and Smart Crawl 2.0