Duplicating a slide

In Master Slider free version I selected Duplicate on one of my current slides. It did create an entry in the index with the same name plus it added “copy” to the name. It also created a new shortcode for the new entry. Just as I expected. When I select any slider to attempt to edit, it takes me to a page within Master Slider that says “Loading Data…”

I have left it there for over an hour. What has happened to my slides?

They are displaying fine on the web page. How can I get to edit them again?

Thank you,

Docfxit

https://wordpress.org/plugins/master-slider/