It looks like you are using the regular embedding code (https://www.juicebox.net/support/embedd … -html-page) so your gallery's 'jbcore' folder should be in the same directory as the embedding page ('pumpkin-gallery-jb.html').
Therefore, your gallery's 'juicebox.js' file should be located here: http://www.pumpkingutter.com/jbcore/juicebox.js
However, going directly to that location in a browser results in an error 404 (file not found).
Upload your gallery's 'jbcore' folder to your root directory (alongside your 'pumpkin-gallery-jb.html' web page) and your gallery should display as expected.
Please let me know how you get on.
(Incidentally, I see a white screen in my desktop browser, too. It's the same problem, though, so the solution above should allow the gallery to be displayed in all browsers.)