I’m using the Divi theme by Elegant themes and am unable to get single images to open in lightbox (I haven’t tried gallery yet). You can see a few linked images here:
http://www.wazatronstudios.com/sound-design/limbo/
I’ve looked through the forums and see suggestions on how to add a “rel” value to the image link, but in using the build-in Divi Page builder I’m unable to manually modify links like that. Is this perhaps a dead-end?