Thanks Ed,
I created a second portfolio item with a thumbnail and set “thumbnail type” to “lightbox to the thumbnail image” and I still have a repeated image..
BUT.. (now that I have two portfolio items set to lightbox mode) I now see that the lightbox is in fact displaying the images for both portfolio items, plus their repeats. So clicking on a thumbnail shows 4 images in the lightbox slider thing.
I’ll test again with the new update.
I appreciate the great support btw!