Lightbox does not display photo

Hello,

I have created an album gallery and had set the thumbnails linked to slideshow mode. I want to change the display of photos when cliked on any thumbnail in the album to lightbox view. I made every possible combination pf settings, been on this for 5 hours and nothing. I get the lightbox overlay with the press f for fullscreen, option that works, but absolutely no photo.

Please help me, this is a work thing and it is very very urgent !

Thank you

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