Thank you for providing the URL to your gallery's web page.
I think the problem might be that your URL includes an IP address and a port number.
Try using your domain name instead (for your shareURL and when you access your web pages in your browser).
Hopefully this will solve your problem.

WP-Juicebox (the Juicebox plugin for WordPress) supports only one gallery per page or post.
If you want to embed multiple galleries on a single page or post, you'll need to embed them manually.
I would recommend using the baseUrl method of embedding as documented here.
Essentially, once you have created a gallery with JuiceboxBuilder-Pro, you would upload the complete gallery folder (not just the contents) to your web server and paste the baseUrl embedding code into the body of your WordPress page or post (ensuring that the method of entry is 'Text' rather than 'Visual'). It does not matter where on your web server you upload your gallery folder to as long as the two paths in the embedding code (the path to the 'juicebox.js' file and the baseUrl itself, pointing towards the gallery folder) are correct.

As you have already uploaded a complete gallery folder ('jbox') to your web space's root directory, you can use the following embedding code. The leading slashes in the paths denote your root directory so the embedding code will work in any web page throughout your site without any modification (although you can change the gallery dimensions and background color if required).

<!--START JUICEBOX EMBED-->
<script src="/jbox/jbcore/juicebox.js"></script>
<script>
    new juicebox({
        baseUrl: '/jbox/',
        containerId: 'juicebox-container',
        galleryWidth: '100%',
        galleryHeight: '600',
        backgroundColor: '#222222'
    });
</script>
<div id="juicebox-container"></div>
<!--END JUICEBOX EMBED-->

Notes regarding embedding multiple galleries in a single page or post

(1) Make sure that you embed each gallery into a container with a unique containerId/id.
(2) Load the 'juicebox.js' file only once per web page (not once per gallery).

For example, if you uploaded a second gallery folder ('jbox2') to your root directory alongside your current gallery folder ('jbox'), then you could embed the two galleries in a single page or post using the following embedding code:

<script src="/jbox/jbcore/juicebox.js"></script>

<script>
    new juicebox({
        baseUrl: "/jbox/",
        containerId: "juicebox-container1",
        galleryWidth: "100%",
        galleryHeight: "600",
        backgroundColor: "#222222"
    });
</script>
<div id="juicebox-container1"></div>

<script>
    new juicebox({
        baseUrl: "/jbox2/",
        containerId: "juicebox-container2",
        galleryWidth: "100%",
        galleryHeight: "600",
        backgroundColor: "#222222"
    });
</script>
<div id="juicebox-container2"></div>

Please post the URL to your gallery's web page so that I can see the problem for myself.
(Using the code you posted in a test gallery seems to work fine.)
It would help to see what version of Juicebox you are using, what other configuration options your gallery uses and what other code you have on your gallery's web page.
Thank you.

Thank you for the link.
I see the problem in your own gallery but I have not been able to replicate the problem in a test gallery of my own (using 'Small' and 'Medium' images of the same dimensions as yours, the same configuration options that your gallery uses, the same 'index.html' page code and the same version of Juicebox-Pro).

If it's any indication of the problem, if you open one of the images in a new window (via Juicebox's 'Open Image' button), the image is still displayed very small. After clicking the 'Open Image' button, the image is displayed directly in the browser (with no HTML code at all) and Juicebox is no longer part of the equation.
On a retina display mobile device, the 'Medium' images should be displayed in the gallery and it should also be the 'Medium' images that are opened in a new window.
I would not expect to see such a small image when opened directly in a browser (your images do not appear to be that small).

I don't see anything obviously wrong with your gallery and cannot replicate the problem myself.
The most obvious difference between your own setup and mine is the web server so I'm wondering if there might be something going on server-side that is somehow causing the problem.
Maybe there's some server-side caching going on or perhaps use of a CDN which is currently serving older, smaller versions of your images.
It's all I can think of at the moment. If I think of anything else, I'll be sure to post back.

In the meantime, try creating a fresh gallery with different image ilenames that you know have not been cached anywhere (just rename your images) to see if this makes a difference.

Also, although there is no reason why your gallery with 'Small' and 'Medium' images should not work well, you could try creating a gallery with just 'Medium' images to see if this helps.

That should certainly work fine.

Although the auto-install mechanism works OK for myself, I see a lot of disgruntled users on the Adobe forums. It seems that add-on installation is causing many users problems (sometimes it works, sometimes it does not). Take a look at this forum thread as an example: https://forums.adobe.com/thread/1901283

Maybe the suggestion posted by rndllcprn in the thread will help:

You're welcome!
I'm glad it worked. Thank you for letting me know.

Not yet.
You could override Juicebox's own click handler for the Email Button with your own (to use your own subject text) but I'm not sure exactly what Edge and Internet Explorer are choking on so you might encounter the same problem.
However, if you'd like to try it, you could use something like the following:

<script src="jbcore/juicebox.js"></script>
<script>
    var jb = new juicebox({
        containerId: "juicebox-container",
        showEmailButton: "TRUE"
    });
    jb.onInitComplete = function() {
        $('.jb-bb-btn-email').off('click');
        $('.jb-bb-btn-email').click(function() {
            window.location.href = 'mailto:email@address.com?subject=Gallery&body=Image No. ' + jb.getImageIndex();
        });
    };
</script>

This workaround uses the Juicbox-Pro API, specifically the onInitComplete event and the getImageIndex method (to fetch the current image number to be used in the email subject).

You're welcome!

Web hosting is probably not as daunting to get to grips with as it first seems.

Once you're signed up for a hosting plan (whether free or otherwise), your web host will assign you some web space. Unless you have purchased your own domain name (from a domain name registrar), your web space will likely be a subdomain of the hosting company (e.g. http://your_name.web_host_name.com).

Next, you will need to set up an FTP (File Transfer Protocol) account. FTP is just a way to copy files from your computer to your web space (on your web host's server).
You should be able to do this via your web host's online control panel. (Your web host should be able to help you with this.)

Once you have an FTP account, you can log into your web space with an FTP program such as Filezilla (free) using the credentials supplied by your hosting company (host, username and password).
When you log in to your web space, you will likely find a folder named 'public_html'. This is the folder that you will upload files to for them to be publicly accessible on the internet.
Uploading a gallery folder from your computer to your web space is essentially just a single drag-and drop action within Filezilla's interface.

Details will vary slightly between hosts but these are the basics. Your web host should be able to fill in the blanks and help you out with any problems you encounter along the way. Of course, I'll be happy to help with any Juicebox-related issues so post back here if you get stuck.

Take a look at the links below for more information.
How to Choose a Web Host: http://www.wikihow.com/Choose-a-Web-Host
FTP: http://www.wikihow.com/Use-FTP

I hope this helps.

Google Drive discontinued the ability to host web pages on 31 August 2016 and Dropbox will follow suit on 3 October 2016.
With this development, we have changed our Embedding in a Web Template Site instructions and now recommend the use of a regular web host (which provides web space that you can upload your gallery files to via FTP).

There are many web hosts that offer free web space which should be suitable for hosting a Juicebox gallery.
A Juicebox gallery does not require any special web server requirements (although PHP v5.2.0 or later is required for Password Protection and Direct Download functionality) so a free hosting account may be all that you need.
Please see the System Requirements for further details.
Try a web search with terms such as 'free web hosting' but please bear in mind that with a free hosting account, you will likely get little or no support, less reliability (more server down-time) and fewer features than with a paid account.

I hope this points you in the right direction.

I'm glad you've got it working.
Thank you for letting me know.