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.

You're welcome!

Temporarily turning off Bitdefender whilst installing JuiceboxBuilder-Pro (or making an exception in Bitdefender for the 'JuiceboxBuilder-Pro.air' installation file) would be the first thing I'd try.
Hopefully this will resolve your problem and allow you to successfully install JuiceboxBuilder-Pro.

You're welcome!
I hope you get on OK.
If you run into any difficulties, please let me know and I'll do my best to help you out.

You're welcome!

If you want to build a new website around Juicebox galleries, then you might like to take a look an another one of our products, Showkase, which allows you to create a complete HTML 5 portfolio website.

Showkase is a PHP web application which in installed on your web server and whose interface is accessed via a web browser.
Showkase has full support for Juicebox-Pro and the galleries can be created within the application itself via its interface (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) 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).

Alternatively, as you have already mentioned WordPress, you might like to try using WordPress to create your website.
There is a dedicated Juicebox plugin for WordPress, WP-Juicebox, which allows you to create and embed Juicebox galleries in WordPress pages and posts without any manual coding.
WordPress can quite easily be used to create a complete website (it is no longer just the blogging platform it started out as) although it it by no means as Juicebox-centric as Showkase.

Under the HTML 4.01 Transitional Doctype, there are certainly fewer errors and warnings for your web page than under the HTML 5 Doctype (which makes sense, knowing that your code is quite old). As before, many of the errors are trivial and will not actually cause any problems when your web page is viewed in browsers.
For example, just add an alt="image" attribute to all the <img> tags on your page and a type="text/javascript" attribute to all the <script> tags on your page and that will fix 7 of the errors straight away.

No problem. I'm glad my suggestions worked.

Both your images have exactly the same aspect ratio so they will both be scaled similarly for the Splash Page.
When the image is displayed in the gallery, it is dynamically scaled down to fit within the image area, respecting its aspect ratio and without any cropping (so the top and bottom of the image are flush with the top and bottom of the gallery and there is space to the left and right of the image which cannot be seen as you have a transparent background).
When the image is used for the Splash Page, Juicebox scales the image to ensure that there is no empty space (so the left and right sides of the image are flush with the left and right sides of the gallery and the top and bottom of the image are cropped as it is vertically centered).
You'll need to provide an image which has the same aspect ratio as your gallery (270:400 -> 1:1.48) if you do not want the Splash Page image to be cropped.
You could either reduce your image's height (by cropping the bottom of your image yourself), or increase your image's width (padding the left and right sides with blank space by increasing the canvas area).

I hope my notes above are helpful.

Thank you for the update.

Just for clarification, the sourcePath is used only internally by JuiceboxBuilder-Pro (when editing a gallery). It is not used by Juicebox when the gallery is displayed.
JuiceboxBuilder-Pro stores the original paths of the source images (as sourcePath entries) in case it needs to re-process the source images (for example to remove watermarks).
The images displayed in the gallery are the imageURL and thumbURL.

The %20 indicates that the image has (at one point or another) had a space in the filename (%20 is the percent encoding for a space).
As an image filename forms part of a URL when uploaded to a web server, it would be wise to use only web-safe characters within image filenames. Please see section 2.3 of this document for details.

JuiceboxBuilder-Pro can handle all images whose filenames use any or all of these unreserved characters.

This sounds more and more like there's a lock on certain gallery files preventing JuiceboxBuilder from re-saving the entire gallery. Unfortunately, I still do not know what might be causing this although it's certainly not a widespread problem as you are the first person to report it (as far as I can remember) which suggests that there may be something unique to your own computer which might be at the root of the problem.

Try using only files with web-safe filenames to see if the problem continues to occur.

I really do not know why Juicebox is unable to display your gallery images after you edit a gallery.

It is not something that I have been able to replicate. I have never seen this before and, as far as I can recall, no-one else has reported such a problem so the cause might be something unique to your system or setup.

As I suggested a couple of posts ago, maybe you could provide me with a couple of sample zip files: one of your gallery folder before editing and another of your gallery folder after editing. Once I'm able to compare the two versions of your gallery folder, I might have a better understanding of why you are unable to see your gallery images after editing.

The file-lock/auto-backup scenario might still be playing a part in the problem.
Try temporarily turning off your auto-backup program (or at least make an exception for the location of your gallery folder so that your auto-backup program does not interfere with it) to see if this makes a difference.
Also, make sure that the location you use for your gallery folder is not synced to a cloud backup service (such as Dropbox or Google Drive).

To clarify, after editing an existing gallery, JuiceboxBuilder-Pro will resave the entire gallery but, if all you do is change some configuration options (and do not add or remove any images), then the only file you need to reupload to your web server is the gallery's 'config.xml' file.

That's great! Thank you for letting me know.