I’m having one (and only one) of the same issue and also using Prestige.
–> No navigation to additional images from the lightbox
Lightbox wasn’t working at first but the theme author suggested inserting rel=”lightbox”
in the code box in advanced options in the ngg/lightbox menu. That solved the issue and brought up a lightbox instead of linking to the image url BUT no links to next or previous images came up. So…
I too rolled back ( to 1.9.13) and the missing navigation from image to image persists.
Any help would be welcomed.