WP-SimpleViewer: Large Image doesn't appear next to thumbnails

I’ve been having a REALLY hard time loading galleries with SimpleViewer. The 1st and 2nd galleries I created, didn’t work, so I ended up deleting them.

The 3rd gallery is working perfectly.
See: https://katemissett.com/wordpress/galleries/canopic-jars

I just created gallery 4, but it’s only showing the thumbnails, with a weird teeny square for the large image.
See: https://katemissett.com/wordpress/galleries/sculpture

I can’t figure it, so would appreciate some help from anyone who’s had the same problem with this gallery.

Using:
WordPress 3.5.1
SimpleViewer 2.3.2.1

I need to finish my client’s site by this Saturday, so would appreciate a quick response.

Thanks!

https://www.ads-software.com/extend/plugins/wp-simpleviewer/