quote:The "enlarged" pic is in the upper left corner (not centered as it should be)
IMO...That's as designed (as seen in your example with 24). You need to account for low-res monitors at 800x600 in thinking about layout with a 400+ wide large image and 80x80 thumbs. Don't forget, you also have template borders and margins to consider. I believe that's why they semi-wrap the large image at right and bottom, and the images at right require off-center of the main image, i.e. space efficiency in attempt to have all the images on-screen at low-res. It also explains the limitation on positions (too large a field for either left or right).
Is it possible the problems with #23 and #24 are relevant to a specific template. If you swap for the template you used in the posted example, does that help?
Danno
BTW....I used the Thumbnail Viewer on all my Antiquarian book sales in the Spring, per my posted example. It does the job, but does need planning and consideration for template and image placement for good results.