Laza, the skin has trouble with large image bounds (1920x1080 in this case), large pano images (5:1, attached), and Projector > Lightbox > Main image > Original (1:1) size. That's not a surprise - when dealing with large pano's, a user shouldn't be making that selection.
But Project > Lightbox > Main image > Fit vertically (panorama) also produces a bad image display - I never get an actual, horizontally scrollable pano with that setting.
The only setting that works is Projector > Lightbox > Main image > Fit both dimensions.
The Cover setting is awful with almost any images. What's the intent of that choice?