Unable to setup a Lightbox


Since the update to the Upfront theme to version 1.7, I have not been able to setup a Lightbox at all.

It seems that once I have entered a Lightboxes name and click the 'tick', nothing actually happens.

On an Image > More... > Link image > Select Lightbox from the dropdown menu
> Enter a name for the Lightbox > Click the 'tick' > Nothing happens

Previously I would have named the Lightbox, opened it and this would have allowed me to drag elements into it to edit.

Is there something I am missing?

Thank you!