I am in this circumstance too.
http://briansimageworld.econethub.com/open/ doesn’t display thumbnails whether set as lightbox or slideshow. Shortcode from tool: [ims-gallery id=LvO51kEFUhlX layout=lightbox number=all linkto=file]
This page does show the test images using simple shortcode from your docs: [image-store]
http://briansimageworld.econethub.com/galleries/
I have tested many parameters to no avail.
Very few plugins are active. No nextgen.
using ‘twenty thirteen’ default theme
WP multisite and buddypress