The previous and next navigation buttons in the image display “lightbox” popup appear as an overlay above the images. You can still right click to save an image, but you need to right click away from the navigation arrows which may cover a large invisible portion of the image. Try right clicking along the top or bottom edges or toward the center of the image. You cursor will change from a pointing hand to a standard arrow pointer when it is safe to right click for saving an image. See the image here for a diagram with the right click zone shaded lighter than the navigation areas.
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