Re: very first publish fails on simple test page !!
Here are two things to try:
(1) Make sure that your WP-Juicebox installation is using Juicebox-Pro (and not Juicebox-Lite which it comes bundled with). Juicebox-Pro configuration options such as galleryTitlePosition are not supported by Juicebox-Lite. You can check which version of Juicebox (Lite vs Pro) your WP-Juicebox installation uses by looking at the "WP-Juicebox" menu label in the WordPress dashboard. It'll read either "WP-Juicebox (Lite)" or "WP-Juicebox (Pro)" (as long as you're using the latest version of WP-Juicebox (v18.104.22.168). Also, if you are using Juicebox-Lite, then your gallery will have a Juicebox logo in the lower right corner.
If you are using Juicebox-Lite, then in order to use Juicebox-Pro configuration options, you'll need to upgrade your WP-Juicebox installation to use Juicebox-Pro by following the Upgrading to Juicebox-Pro instructions here.
(2) After changing your gallery settings, try completely clearing your browser's cache before reloading your gallery's web page to ensure that your browser is not still using older cached versions of your gallery files.
Incidentally, the link you posted previously (https://www.stevezavodny.com/blog/galle … index.html) shows a gallery with no gallery title, no captions and a single column of thumbnails to the left of the main image (it looks like what you are aiming for) so, if you do not see this yourself, then the problem is likely a browser caching issue and clearing your browser's cache (or using a different browser) should show you the gallery as you expect it to be displayed.