I'm not entirely sure what the problem is but here are 3 things that you can try.

(1) I notice that you are currently using Juicebox-Pro v1.4.3.2.
There have been 5 official releases since v1.4.3.2 (the current version being v1.5.1) with many bugfixes. Please see the Version History page for a full list of changes between versions.
I would recommend upgrading your Juicebox-Pro galleries to the current version to see if this helps with your problem.
Full instructions for downloading the latest version and upgrading existing galleries can be found on the Upgrading Juicebox support page.
(You can upgrade an existing gallery by simple swapping its current 'jbcore' folder with the 'jbcore' folder from the latest Juicebox-Pro download zip package ('juicebox_pro_1.5.1/web/jbcore').)

(2) I notice that your 'Urbano' gallery uses slightly different configuration options than your 'Paisajes' gallery (for example).
Try changing your 'Urbano' gallery's 'config.xml' file to make sure that it uses the same configuration options as your other 2 galleries. This might help.

(3) Your 'Urbano' gallery currently has both a galleryWidth of '100%' and a galleryHeight of '100%' (set in the gallery's embedding code) whereas your 'Paisajes' gallery (for example) has a galleryHeight of '100%' but a galleryHeight of '80%'.
Try changing your  'Urbano' gallery's galleryHeight to '80%', in line with your other 2 galleries, in case this makes a difference.
(If a gallery has both a galleryWidth of '100%' and a galleryHeight of '100%' but the gallery's parent containers do not have heights specified by CSS, then Juicebox might determine that the gallery takes up the entire web page (100% x 100%) and the gallery's layout may differ because of this.)

Hopefully these suggestions will help,
Please let me know how you get on and if I can be of any further assistance.

You're welcome!
At least there is a workaround if you ever need to create a large gallery.
It's unfortunate but the problem seems to be a limitation of Adobe AIR with little that can be done from within JuiceboxBuilder-Pro's code to overcome it.
However, a bug report has been logged so, if anything can be done to improve the situation, at least the developers are aware of the issue.

There is no limit to the number of images that you can have in a gallery but you might not be able to add all the images to JuiceboxBuilder-Pro at once.

Unfortunately, if you try to add many images to JuiceboxBuilder-Pro at once, then Adobe AIR (the platform on which JuiceboxBuilder-Pro runs) may not be able to allocate enough memory for the task at hand. Even if your computer has plenty of free RAM, Adobe AIR applications are limited to around 1GB of memory allocation (as far as I am aware).
The workaround is to add your images in multiple smaller batches. Trial and error will help to determine a safe number of images per batch (it will depend on your own images). From your notes, it sounds like you should be able to add images in batches of 100 (or less). Try adding 100 images in your first batch and then the remainder of 78 images afterwards.

I hope that adding your images in a few separate actions instead of just one is not too much of an inconvenience although I realise that it is not ideal.

Thank you for trying my suggestion but I notice that the paths in your embedding code are incorrect.
I meant for you to try the exact code I posted above (rather than just adding a leading slash to your full https:// path).
Please try again using the code I posted above.

Incidentally, I notice that you seem to have removed your 'shumbatestgallery' gallery folder and have replaced it with a 'shumbatestgallery1' gallery folder which seems to an incomplete gallery folder (it does not contain a 'config.xml' file).

If reinstating your original 'shumbatestgallery' gallery folder and using the code from my previous post does not work, then please try the following.

(1) Create a sample gallery in JuiceboxBuilder-Pro and save it to a new empty folder named 'my_gallery'.
(2) Upload the entire 'my_gallery' folder to your root directory.
(3) Create a new HTML file in a plain text editor containing the code below and name it 'test_file.html'.

<!DOCTYPE html>
<html lang="en">
<head>
    <title>Juicebox-Pro Gallery</title>
    <meta charset="utf-8" />
    <meta name="viewport" id="jb-viewport" content="width=device-width, initial-scale=1.0, minimum-scale=1, maximum-scale=1, user-scalable=0" />
    <style type="text/css">
    body {
        margin: 0px;
    }
    </style>
</head>
<body>
    <!--START JUICEBOX EMBED-->
    <script src="/my_gallery/jbcore/juicebox.js"></script>
    <script>
    new juicebox({
        baseUrl: "/my_gallery/",
        containerId: "juicebox-container",
        galleryWidth: "100%",
        galleryHeight: "100%",
        backgroundColor: "#222222"
    });
    </script>
    <div id="juicebox-container"></div>
    <!--END JUICEBOX EMBED-->
</body>
</html>

(4) Upload the 'test_file.html' file to your root directory (alongside your 'my_gallery' folder).
(5) You should now be able to view the gallery on its own web page by visiting https://www.ridgeback-douala.net/test_file.html

This should test the baseUrl functionality on your web server.

If this test scenario works, then something on your own gallery's embedding page may be causing the problem.
Load your own gallery's embedding page and check your browser's developer tools for JavaScript errors, custom CSS which might be hiding the gallery or HTML elements which might be obscuring the gallery.

If this test scenario does not work, then something on your web server may be causing the problem.
Check to see if you have an '.htaccess' file on your web server with any rewrite rules which might be interfering with the gallery files.

I hope this points you in the right direction.

I notice that you use absolute paths in your embedding code starting with http:// but you quote your website URL with an https:// link.

Try using relative paths in your embedding code starting with leading slashes (to denote your root directory).
This should work with both http:// and https:// (and also for accessing your domain with and without the www subdirectory).

Also, as you currently use a galleryHeight of 100%, this means that the gallery's actual height will be 100% of the height of the gallery's parent container so be sure to assign your gallery's parent container a height via CSS (otherwise Juicebox might not be able to determine what the gallery's actual height should be).
Try setting a galleryHeight of 600px, at least for testing purposes, to be sure that the gallery has valid dimensions and will be visible once the path problems have been ironed out.

Try the following:

<!--START JUICEBOX EMBED-->
<script src="/shumbatestgallery/jbcore/juicebox.js"></script>
<script>
    new juicebox({
        baseUrl: "/shumbatestgallery/",
        containerId: "juicebox-container",
        galleryWidth: "100%",
        galleryHeight: "600",
        backgroundColor: "rgba(34,34,34,)"
    });
</script>
<div id="juicebox-container"></div>
<!--END JUICEBOX EMBED-->

Hopefully this will help.
Please let me know how you get on. Thank you.

Problem solved via email. (Full uninstallation/reinstallation solved problem.)

Problem resolved via email.

Solution was:
(1) Uninstall both JuiceboxBuilder-Pro and Adobe AIR
(2) Install an older version of Adobe AIR (v20.0)
(3) Install JuiceboxBuilder-Pro v1.5.1
(4) Upgrade Adobe AIR to current version (v32.0)

If anyone reading this thread encounters a similar issue and wants to try this solution, older versions of Adobe AIR can be downloaded from this archive page: https://helpx.adobe.com/air/kb/archived … rsion.html

Thanks for trying Safe Mode.
There seems to be some sort of incompatibility between JuiceboxBuilder-Pro and your computer as no-one else has ever reported the issue that you are facing before.
Unfortunately, I'm unable to replicate the problem myself which makes troubleshooting that much more difficult.
Please check your email. I have sent you a message.

A web search for 'kernelbase.dll crash' returns many results (none for JuiceboxBuilder-Pro) but there does not seem to be an accepted solution for all scenarios and I think you've tried pretty much every suggestion I've come across and thought of.

One thing we've not tried yet, though...
Try booting into Safe Mode and running JuiceboxBuilder-Pro from there.
If it works OK in Safe Mode, then some other program or driver that is loaded and running in normal mode could be causing the crash.

Here's how to start your PC in Safe Mode in Windows 10:
https://support.microsoft.com/en-us/hel … -safe-mode

Unfortunately, previous versions are not available for download. (All download links always point to the latest version.)
However, I don't think reinstalling v1.5.0 would help.
As far as I am aware, there were no code changes between v1.5.0 and v1.5.1 which should have any bearing on the startup procedure.

Have you tried JuiceboxBuilder-Lite yet? Does it crash on opening (like JuiceboxBuilder-Pro does) or does it run correctly (like the other AIR applications you have tried)?

As far as I can recall, no-one else has ever reported the problem that you are experiencing (with any version) so it seems to somehow be unique to your system.
I really don't know what is causing your problem and I've already suggested pretty much everything I can think of.

Maybe if we could find out how the JuiceboxBuilder-Pro.exe file ended up in your C:\Users\Liam\Documents\JuiceboxBuilder-Pro\ folder, we might have a clue as to the nature of your problem.

Out of interest, what are the current contents of your C:\Program Files (x86)\JuiceboxBuilder-Pro\ folder?
This folder should contain the following:

Here are two more suggestions:

(1) Try running JuiceboxBuilder-Pro not from the desktop shortcut but, instead, by navigating to C:\Program Files (x86)\JuiceboxBuilder-Pro\ in Windows File Explorer and then right-clicking the JuiceboxBuilder-Pro.exe file and selecting 'Run as administrator'.

(2) As you are currently running Windows 10 version 1809 (build 17763.615), try upgrading to the current version (version 1903, build 18362.239). The kernelbase.dll file will be updated when you upgrade Windows 10 to version 1903 and this might help to resolve your problem.

Being that you are currently experiencing difficulties, I should perhaps point out that there are other methods of creating Juicebox galleries which do not require JuiceboxBuilder-Pro, many of which use plugins for other programs (such as Lightroom or Photoshop). If you use Lightroom or Photoshop, you might like to give them a try. Please see the Juicebox Plugins support page for details.

You can also create a gallery manually using the sample 'web' gallery (from the Juicebox-Pro download zip package) as a template. Instructions can be found here.

I'd certainly check the contents of the C:\Program Files (x86)\JuiceboxBuilder-Pro\ folder, run JuiceboxBuilder-Pro via the right-click 'Run as administrator' option and upgrade Windows 10 (to version 1903) as the next things to try.

Please double-check your version of Firefox and, assuming you are running Firefox 68.0 (the version which introduced the security restriction causing the problem), please try the instructions again.
The privacy.file_unique_origin preference does exist in my own Firefox 68.0 browser and the solution I posted worked for myself and another user in this forum thread.
Please also see the screenshot attached to this post which shows the privacy.file_unique_origin preference in the about:config section of my own Firefox browser.