Hello,
I have the same problem as private photo are not displayed when clicking on it. I can see the thumbnails but not the photo itself. Did you ever found a way to make it work ?
Yes the option works but I only get the tag rel=”lightbox-post-” for each image. In the code, I should also have the post ID but doesn’t appear at the end of the tag (like rel=”lightbox-post-1234″).