lightbox not working anymore in slideshowonly

The code looks good. This does also not happen on my test sites. Possible causes with this kind of issues is mostly an ‘unwilling’ optimizer, like server caching plugin or javascript compressor. If you have some of these plugins/features active, temporally de-activate them to see if it will work again.

I disabled the cache but it still doesn’t work.
The strange thing is that if I change it to type=’thumbs’ it works. When I change it back to ‘slideonly’ it doesn’t.

There is some layer over the image, preventing the click to arrive on the image. Also, the image has the cursor set to the small magnifier, but we see the arraow.
The context menu is altered, si, i think you have some kind of image protection (the right mouse button does no longer has the option to capture the image.
If you want copy protection of the image, use the wppa method: Table IV-A31 and no other method.

Thanks, that helped a lot. You pointed me into the right direction. I have a css modification to get the dropdown of a submenu visible. It was hidden behind the slideshow after I used the twenty twenty theme.

The modification was:

.slide-frame {
 z-index: -1
}

If I changed this into:

.slide-frame {
 z-index: 0
}

Both the submenu is visible and the lightbox works!

So its not because of updating wppa.
See also: https://www.ads-software.com/support/topic/css-for-theme-twentyseventeen/