Can't display captions

Continuing the discussion from Gallery 3 – Lightbox Caption:

Hi Jannis - I’ve just bought Gallery 3 and am pleased with the visual results but can’t get any captions to display.
Grid is Flexbox Lightbox is baguette box. I haven’t nominated a slider as they all seem to stop you showing single pics. I’m not at all technical but need a site for my work. Many thanks

Please send me a link and a screenshot of your settings of the child stacks you selected (flexbox, baguette box).