If the folder contains only presets, then it is doubtful that removing the folder will help.
However, in the absence of knowing exactly what is causing your problem, I would not rule anything out quote yet.
Try temporarily removing the folder (either rename it and then rename it back to its original name afterwards or move it to a different location and move it back to its original location afterwards) whilst JuiceboxBuilder-Pro is closed to see if this helps.

No, this is not the problem. JuiceboxBuilder-Pro does not need a special code or use a serial number (although downloads are restricted to licensed users only and installing the application without a valid license would violate the terms of use).
As long as you have the JuiceboxBuilder-Pro.air installation file, you should be able to install and run JuiceboxBuilder-Pro successfully.

I'm glad that you have at least been able to upgrade the Photoshop plugin to Juicebox-Pro and get local viewing working in Safari 11. Thank you for letting me know.

Showkase is a PHP web application (installed on your web server rather than your computer) which is designed to create a complete portfolio website (integrating multiple galleries) in a web browser interface, although you could use Showkase in its Gallery Manager theme to just create and edit Juicebox-Pro galleries online (which you could embed into other non-Showakse pages throughout your website).
Showkase has full support for Juicebox-Pro and the galleries can be created within the application itself (or created with JuiceboxBuilder-Pro and imported).

You can create Gallery Index pages and have as many galleries listed on each Gallery Index page as you wish.
Each gallery is represented by a thumbnail image with the gallery title displayed below and the gallery is opened when the user clicks on the image.
Demo sites created with Showkase can be found here and a sample Gallery Index page can be found here.

Showkase can also create non-gallery pages (About, Basic and Contact pages) where you can add information about yourself (or any other content you like).
All of this is done automatically within the Showkase interface without the need for any manual coding at all.
You can take a look around the Showkase interface by logging into the Live Demo Admin.

Showkase can be purchased as Showkase-Standard (which comes with Juicebox-Lite, the free version) or Showkase-Pro (which comes with Juicebox-Pro).
The only difference between Showkase-Standard and Showkase-Pro is the bundled viewer (Juicebox-Lite vs Juicebox-Pro).
If you want to purchase Showkase-Pro (less expensive that purchasing Showkase-Standard and Juicebox-Pro separately), then we would happily refund you in full for your Juicebox-Pro purchase.

There is more information on the differences between Juicebox and Showkase in this forum thread.
If you have any further queries, please let me know.

Getting back to JuiceboxBuilder-Pro, have you tried creating a new administrative user account and installing and running JuiceboxBuilder-Pro under the new user account yet?
I still think this is worth a shot. It should at least let us know whether there is something about your present user account which is causing your problem or otherwise perhaps a system wide contributing factor.

Unfortunately, I really do not know what might be causing your problem.
If a clean install of both Adobe AIR and JuiceboxBuilder-Pro does not work, then it sounds like there might be something on your system (such as some security software) that is interfering with the functionality of the application.
Did you try creating a new administrative user account and installing JuiceboxBuilder-Pro under the new user account?

If you have successfully replaced the Lite 'jbcore' folder with the Pro version, then the plugin has no choice but to create Juicebox-Pro galleries. (The plugin will no longer contain the Juicebox-Lite files.)
You can check to see if your galleries are Lite or Pro by the presence of the Juicebox logo in the lower right corner of the galleries. The Juicebox logo is present in all Lite galleries but not in Pro galleries.
Please note that upgrading the plugin does not change the plugin's interface. The interface will look the same as before upgrading (only Lite options can be changed in the interface) but all galleries subsequently created by the plugin will be Pro galleries (with no branding or image limit). Galleries created with the plugin can be customized with Pro configuration options by opening them in JuiceboxBuilder-Pro (but I realise that you cannot currently do this).
Programs and plugins which feature all Pro configurations in their interfaces are JuiceboxBuilder-Pro, the Juicebox Lightroom Plugin and Showkase.

Juicebox galleries cannot be viewed locally in all browser due to certain security restrictions.
Please see this FAQ for details:
When I view my gallery locally, I see the message "Juicebox can not display locally in this browser". Why?

This issue is specific to viewing galleries locally (from your computer's hard drive) and there is no such issue once the galleries have been uploaded to a web server (where they can be viewed in any modern browser).

If you encounter the "Config file not found." message whilst trying to view a gallery locally in Safari 11, then please see this forum post for a full explanation and a workaround.

Unfortunately, Safari 11 (released 19 September 2017) introduced a new security restriction which prevents local viewing of Juicebox galleries by default. Selecting 'Disable Local File Restrictions' from Safari 11's 'Develop' menu (full instructions in the link above) should, once again, allow you to view your galleries locally in Safari 11.

You're welcome!

I'm glad that you've been able to resolve your problem.
Thank you for taking the time to let me know. It's most appreciated.

The 'height' attribute is, indeed, not allowed on a <div> element in HTML 5 but it seems that using the jQuery height(value) method on a <div> such as:

<div id="test"></div>
<script>
$(document).ready(function() {
    $('#test').height(600);
});
</script>

... actually sets the height using inline CSS via a 'style' attribute rather than a 'height' attribute (at least in my own tests) as follows:

<div id="test" style="height: 600px;"></div>

... which is valid HTML 5, so I'm not quite sure why using css(propertyName, value) works whereas height(value) does not.

In any case, I'm glad that you've been able to fix your problem.
Thank you for sharing your solution. It might certainly help others facing a similar problem.

The viewport meta tag will affect how your web page looks on mobile devices only. It will have no effect in desktop browsers.

Your gallery currently has a fixed width of 748px (galleryWidth: "748") so your gallery's width will always be 748px, regardless of the dimensions of other containers on your web page.
Instead, set your gallery's width to be 100% (galleryWidth: "100%") and your gallery's width will always fill the width of the gallery's parent container (no matter what the width of the gallery's parent container is).

This should hopefully solve your problem.

I'm glad you've found the 'Publish' tab. Thank you for letting me know.

The 'Save' option ('Gallery -> Save') from the drop-down menu at the top will be greyed out until the location of the gallery folder is known by JuiceboxBuilder-Pro, either by opening an existing gallery folder ('Open Gallery...' from the 'Start' tab) or by first clicking 'Save' on the 'Publish' tab (for a new gallery).

I hope this helps to clarify things.

The Email Button is a 'mailto' link which opens the user's default email client.
If the user has an email program installed (such as Outlook or Thunderbird), then this program will be opened (in its own window) whether the gallery is in an iframe or not.
However, I suspect that your default email client may be a web service (such as Gmail) and that this might be the root of your problem.

I have an email program installed and it opens fine when using the Email Button from both of your links.
If I then change my browser's 'mailto' action to 'Use Googlemail', then the Email Button still works fine from both of your links (but the email page replaces the gallery page in both instances).

What browser do you see the problem in and what is your default email client?
Also, what exactly do you mean when you say that it does not work? Does nothing happen at all when you click the Email Button or does it just not work as expected? (It works fine on my own system with an email program installed.)

The code which sets the click handler for the Email Button is buried deep within the 'juicebox'js' JavaScript file which is obfuscated and cannot be modified.
The only thing you could do is override Juicebox's own handling of the Email Button and introduce your own functionality instead.
You could try something like this:

<!--START JUICEBOX EMBED-->
<script src="jbcore/juicebox.js"></script>
<script>
    var jb = new juicebox({
        buttonBarPosition: "TOP",
        containerId: "juicebox-container",
        emailAddress: "email@address.com",
        emailSubject: "Gallery",
        showEmailButton: "TRUE"
    });
    jb.onInitComplete = function() {
        $('.jb-bb-btn-email').off('click');
        $('.jb-bb-btn-email').click(function() {
            var img = jb.getImageIndex();
            window.open('mailto:email@address.com?subject=Gallery&body=Image No. ' + img);
        });
    };
</script>
<div id="juicebox-container"></div>
<!--END JUICEBOX EMBED-->

The code above will likely open a new tab (even if the user's email client is a program) so it might need some further work but I hope it points you in the right direction and helps to get you started.

I'm not quite sure what you mean by this. Did you save a gallery to a folder full of images? This should not cause any problems but I'd recommend saving each gallery to a new empty folder of its own (just to help keep things organized and separate gallery files from other files). If you keep galleries in their own folders, then you can upload the entire folders (not just the contents of the folders) to your web server (to help keep things organized on your server, too) and then embed the galleries into your web pages using the baseUrl method of embedding documented here.

In any case, I'd search your hard drive again to double-check that there's not still a persistent ".tempGallery" folder somewhere. Such a folder could potentially be the cause of your problem.

Did you try searching for a folder named ".tempGallery" (and then deleting it if found)?
The pre-existence of such a folder when JuiceboxBuilder-Pro is opened (whether caused by Google Drive or by a glitch which somehow failed to remove the folder when JuiceboxBuilder-Pro was previously closed) might be enough to cause the problem.

Also, after uninstalling JuiceboxBuilder-Pro and before reinstalling the application, did you search your hard drive for the term "JuiceboxBuilder" and delete all instances found?

If a completely clean install (with no files left over from a previous installation) does not work, then it sounds like something else on your system might be interfering with JuiceboxBuilder-Pro's functionality.

Try temporarily disabling any security software that you have installed to see if this makes a difference.
Also, try stopping any other programs that you have running in the background (apart from system processes) to see if this helps.

It might also be worth creating a new administrative user account on your MacBook Pro and installing JuiceboxBuilder-Pro under the new user account to see if the application works from there.

I should perhaps point out that there are other method of creating a Juicebox-Pro gallery.
There are several plugins available for different software packages (such as Adobe Lightroom and Photoshop) and you can also create a gallery manually by modifying the sample 'web' gallery from the Juicebox-Pro download zip package.
I realize that it is not as convenient as using JuiceboxBuilder-Pro but it might help if you need to create a gallery urgently until you get JuiceboxBuilder-Pro back and up running.

The first thing I'd try is to close JuiceboxBuilder-Pro and manually delete the following folders:

~/Library/Application Support/Adobe/AIR/ELS/JuiceboxBuilder-Pro
~/Library/Preferences/JuiceboxBuilder-Pro

I do not know what might have caused your problem but deleting the folders above has certainly resolved a similar problem for other users. Hopefully this will solve your problem without any further action.

In order to prevent the problem from reoccurring, make sure that you do not try to save your gallery to (or open a gallery from) a folder which is being synced to an online file sharing service like Google Drive. (This has been known to cause symptoms similar to those you described.) The solution to this (on a Windows PC) is to manually delete the following folder:

C:\Users\Username\Documents\JuiceboxBuilder-Pro\.tempGallery

If you use Google Drive and think that this might have caused your problem, then on your Macbook Pro, try searching your hard drive for ".tempGallery" (inside a folder named 'JuiceboxBuilder-Pro') and delete the folder if found.

One other user reported (a few months ago) that Avast's Ransomware Shield prevented JuiceboxBuilder-Pro from running correctly so, if you use Ransomware Shield, then try making an exception for the JuiceboxBuilder-Pro executable file ('JuiceboxBuilder-Pro.exe') in Ransomware Shield's settings (or try temporarily disabling Ransomware Shield to see if this helps).
Incidentally, this report was 3 moths ago and, at the time, I filed a false positive report with Avast.
An Avast representative replied and ensured me that JuiceboxBuilder-Pro's reputation would be cleared in their next database update so, as long as your Avast databases are up to date, then this should no longer be a problem (but I thought I'd mention it just in case it helps).

If all else fails, then try uninstalling and then reinstalling both JuiceboxBuilder-Pro and Adobe AIR following the full procedure in this forum post.

Hopefully my notes above will help.

It sounds like you are describing Small Screen Mode.

On mobile (small screen) devices, if the gallery is embedded in a web page alongside other content, then Juicebox displays the Splash Page (an image placeholder for the gallery) which, when tapped, expands the gallery to fill the browser viewport (to give the main images as much room to be displayed as possible).
In Small Screen Mode, after tapping the Splash Page (or if the gallery is presented on a web page of its own and the Splash Page is not used), the user will be presented with a grid of thumbnails from which a main image can be selected. (I think it might be this grid of thumbnails that you are referring to.)
When a thumbnail is tapped, the thumbnail page is replaced with the chosen image. (In Small Screen Mode, the thumbnails and main images are displayed on different pages to maximize the area available for the images on small screen devices.)
The user can return to the thumbnail page by tapping the 'Thumbnail' button on the gallery's Button Bar (and can return to the original embedding page by tapping the 'Close Gallery' button).
Please see the Screen Modes support section in the Gallery Tour for more information.

You can choose to not use the Splash Page by setting showSplashPage="NEVER" ('Customize -> Splash Page' section). Using this setting, the thumbnail page would initially be displayed instead of the Splash Page on small screen devices. If you want to skip the thumbnail page and go straight to the first main image in the gallery, then set showSmallThumbsOnLoad="FALSE" ('Customize -> Thumbnails').

Alternatively, you could force the gallery to be displayed in Large Screen Mode (which, by default, does not use the Splash Page and displays the thumbnails and main images together) on all devices and in all browsers by setting screenMode="LARGE" ('Customize -> General').

I hope this helps to clarify things and gives you a few options to try.

There should be no problem with the Button Bar icons as long as the 'jbcore' folder is intact and the 'juicebox.js' file is successfully loaded into the web page. The location of the files should not make a difference (as long as all the paths are correct).

There is clearly no problem with the Juicebox font files or server MIME types as the Button Bar icons displayed fine in your original configuration.

This leads me to think that the problem might be a caching issue (either browser or server side) as the problem seems to happen after you move a file and change a path.

I can't quite figure out exactly what's happening but try the following:

(1) After moving the file and changing the path, try completely clearing your browser's cache before reloading your web page to see if this helps. If browser caching is the cause of your problem, then it is very unlikely that visitors to your website will experience the problem as browsers tend to check for newer versions of files on each browser session.

(2) After moving the file and changing the path, try (temporarily) renaming your 'projext x' folder (this should not break the gallery as long as the path to the 'juicebox.js' file from within the 'index.html' page is relative) and then reload your web page. This will create a completely new unique path to your web page that neither your browser nor your server will have seen before so there should be no strange caching going on. If you find that server caching is the cause of your problem, then ask your web host if they could turn off server caching on your web hosting account.

I hope this helps and points you in the right direction.

If you continue to experience difficulties, please post the link to your web page so that I can see the problem for myself and hopefully help further.