Shortcode generator not working

Hi – love the plugin, works very well other than the shortcode generator – I’ve created them manually and they display fine
but when the shortcode generator pops up there is nothing in the ‘select’ drop down menu (i have 3 items in 1 category)

Quite like the pi but can’t figure this one out

thanks for your help

https://www.ads-software.com/plugins/easy-media-gallery/