@Steven Thanks for your response.  My download link has expired, so I've filled out the new link request form and I'm waiting for that to hit my inbox. 

In the meantime, to update and answer a few questions:

- The gallery I was trying to create was 28 images, 8.84 MB total of all images (images range between 200-700 KB each). 
- I have Juicebox-Pro installed on my desktop and laptop, and both machines were having the same issue.
- I downloaded Juicebox-Lite from the link you provided, and it loaded all images normally, via drag and drop and Browse methods

What's happening when I try to load images on my current installation of Pro:
- I click New Gallery
- I Shift-select my set of .jpg images in Windows explorer, and drag them to the "Drop Images Here" box
- The "+Copy" message comes up on my cursor over the box
- I release the mouse button to drop the images
- Nothing.  No message comes up, no images load, nothing changes.
- I tried using the "Browse" option to load images, with the same result.

Solution?
- While writing this I decided to try adding the images one and a time and in smaller groups.  I found that 2 of the 28 images would not load.  I believe you nailed it with the idea that a corrupted image was hanging it up.  Without those two images, I can load the other 26 in a group, as normal.  Interestingly, as noted above, the current version of Juicebox-Lite loaded/processed those 2 corrupted images just fine.