That's great!
Thank you for posting back to let me know.

Thank you for the additional information in the email you sent me.
It certainly sounds like the problem is due to viewing the galleries over a 3G connection rather than wi-fi.

Please see this FAQ:
Why can't I view my gallery on a 3G mobile connection?

If the problem is, indeed, content modification over a 3G connection, then the solution contained within the FAQ should work fine.
If your web server is Microsoft Internet Information Server (IIS) rather than Apache, then please see this web page for details on how to set the Cache-Control header to 'no-transform'.

I hope this resolves your problem.

Unfortunately, it looks like the latest versions of Android no longer support automatic audio playback on loading a web page. The audio track must be initiated by the user (for example by clicking the Audio Button in a Juicebox gallery).
I cannot find the exact version of Android which introduced this restriction but a web search with terms such as "android auto play audio" returns many web pages which seem to confirm this.
It will not be possible to circumvent this behavior but I have notified the developers in order to update our online support pages with this information.

Please see this web page for details on how to set the Cache-Control header to 'no-transform' on IIS. (Your web host may be able to help you with this.)

The problem you report may be due to a bug whereby elements which have explicitly been assigned a CSS position are not covered by the fullscreen gallery (they should be). The developers are aware of this bug and it should hopefully be fixed in a future version of Juicebox.

Known workarounds are to set either expandInNewPage="TRUE" (so that when the gallery is expanded, it will be displayed on a new page of its own rather than on top of the embedding page, avoiding any CSS conflicts) or to set useFullscreenExpand="TRUE".

If you find that setting useFullscreenExpand="TRUE" does not help and you do not want to use expandInNewPage="TRUE", then you may need to wait for the bug to be fixed. Unfortunately, I do not know how long this may be.

As I mentioned, it is not possible to change the share URL sent to the social media networks.

If you like, you can post suggestions for future versions in the Feature Requests forum thread. This keeps them all together and ensures that they are not overlooked. Thank you.

No, it should not noticeably slow down the loading of a gallery.
I have just run a test using a gallery of 100 images.
I created 3 scenarios:
(1) A standard gallery with a static XML file.
(2) The same gallery but using the 'sort.php' file above (using EXIF info to sort the images).
(3) The same gallery but using the 'sort.php' file with a different sorting algorithm (using just the file name from the static XML file rather than having to extract EXIF info from the images themselves).
All three galleries loaded in pretty much the same time. There was very little difference between the three of them. (In fact, on clearing my browser's cache and reloading the galleries, there as no clear winner in terms of the fastest gallery to load the first image.)

You have a stray ' character at the beginning of your <script> tag's 'src' value which is preventing the 'juicebox.js' file from being loaded.
Change:

.. to:

I have now been able to take a look at your gallery and the configuration options it uses (although I do not have a Samsung S3 on which to test).

Is the audio icon's status always correct, though? When you load the gallery, does the audio icon in the button bar show the 'Click to play audio' status and does a single click (rather than a double-click) play the audio? It sounds like your stock Android browser does not support playAudioOnLoad (like iOS devices) but that the Audio Button is displaying and functioning correctly.
Try a difference browser (such as Chrome) to see if this makes a difference.
Also, try setting expandInNewPage="AUTO" or expandInNewPage="TRUE" (rather than expandInNewPage="FALSE") to expand the gallery on a new page (rather than within the embedding page) to see if this makes a difference.

Maybe this is due do with the fact that your audio tracks are approximately 7MB each and are taking longer to download over 3G. Does the gallery display OK over your 3G connection? If not, please see this FAQ for a solution.

I also notice that your gallery's Back Button icon is not visible.
The Back Button icon's color should be determined by the buttonBarIconColor but is overridden by the textColor (which in your gallery is fully transparent). Either change your gallery's textColor (so that it is not fully transparent) or remove this configuration option from your gallery's XML file and your gallery's Back Button icon should become visible.
(I have logged a bug report with the developers regarding this and it should hopefully be fixed in a future version.)

@wspollack

Thank you for your input. Any information which might help is appreciated.

@patrick7

With regard to my original suggestion of creating a gallery with JuiceboxBuilder-Pro and then doing the sorting dynamically via PHP when the gallery is displayed (rather than when it is created), here is an example which will display the images in the order in which they were taken (comparing the EXIF 'DateTimeOriginal' values for each image) from earliest to latest.

(1) In your gallery's embedding code, use a configUrl to point to a PHP file named 'sort.php':

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

(2) Create the PHP file named 'sort.php' with the following code:

<?php
header('Content-Type: application/xml');
$xml = simplexml_load_file('config.xml');
$arr = array();
foreach($xml->image as $img) {
    $arr[] = $img;
}
usort($arr, function($a, $b) {
    $a_exif_data = @exif_read_data($a->attributes()->imageURL);
    $b_exif_data = @exif_read_data($b->attributes()->imageURL);
    $a_exif_date = !empty($a_exif_data['DateTimeOriginal']) ? strtotime($a_exif_data['DateTimeOriginal']) : '';
    $b_exif_date = !empty($b_exif_data['DateTimeOriginal']) ? strtotime($b_exif_data['DateTimeOriginal']) : '';
    return $a_exif_date - $b_exif_date;
});
$dom_doc = new DOMDocument('1.0', 'UTF-8');
$dom_doc->formatOutput = true;
$settings_tag = $dom_doc->createElement('juiceboxgallery');
foreach ($xml->attributes() as $key=>$value) {
    $settings_tag->setAttribute($key, $value);
}
foreach($arr as $img) {
    $image_element = $dom_doc->createElement('image');
    foreach($img->attributes() as $key=>$value) {
        $image_element->setAttribute($key, $value);
    }
    $title_element = $dom_doc->createElement('title');
    $title_text = $dom_doc->createCDATASection($img->title);
    $title_element->appendChild($title_text);
    $image_element->appendChild($title_element);
    $caption_element = $dom_doc->createElement('caption');
    $caption_text = $dom_doc->createCDATASection($img->caption);
    $caption_element->appendChild($caption_text);
    $image_element->appendChild($caption_element);
    $settings_tag->appendChild($image_element);
}
$dom_doc->appendChild($settings_tag);
echo $dom_doc->saveXML();
?>

(3) Place the 'sort.php' file in your gallery folder (in the same directory as the gallery's 'config.xml' file).

This solution relies on the images in the gallery's 'images' folder having EXIF info.
Please note that JuiceboxBuilder-Pro strips EXIF info when resizing images so, if you are using JuiceboxBuilder-Pro to create your gallery, you may need to resize your images in an imaging program such as Adobe Photoshop (and ensure that the EXIF info is retained when saving them) before feeding them to JuiceboxBuilder-Pro and then deselect the 'Resize Images' checkbox (on the 'Images' tab) so that JuiceboxBuilder-Pro just copies the images (with EXIF info intact) into the gallery's 'images' folder.

I hope this helps.

Thank you for posting your suggestion in the Feature Requests thread. (It keeps all the suggestions together and ensures that they are not overlooked.)

The only sorting options available within the JuiceboxBuilder-Pro interface are 'By File Name', 'By File Date' and 'Reverse' (from the 'Images -> Sort' drop-down menu at the top) and the ability to drag and drop a thumbnail (or a Ctrl+Click or Shift+Click selection of thumbnails) into a new position on the 'Images' tab.
There are no other automated methods of sorting images within a  gallery.

It would be possible to sort image's dynamically using a server-side scripting language such as PHP (no matter what order the images actually are in the gallery's XML file) but it would likely involve a lot of work to create such a script and knowledge of PHP would be required.
You would load the PHP script using a configUrl in your gallery's embedding code.
The script would then read the gallery's own static XML file, store the image tag data in an array, sort the array into whatever order you require (assuming that the property that the sorting relies on is available within PHP) and then output a new XML file on-the-fly.
This would be further complicated by the need to ensure that all associated thumbURL, linkURL, linkTarget, <title> and <caption> entries are still attached to their respective images.
It might also not be quite as fast as loading a gallery with a static XML file (especially in a gallery with a large number of images) but it might be an avenue you wish to pursue further.

@aleckaram

Please post the URL to your gallery so that I can take a look.
Also, please let me know exactly which devices and browsers (and version numbers) you use.

Also, please bear in mind that playAudioOnLoad (the ability to start playing audio automatically when the gallery is loaded) is not supported on iOS devices.
(This is noted in the description of the playAudioOnLoad configuration option on the Config Options page.)

Thank you.

In the code you posted above, the showImageNumber="false" configuration option comes after the > character which closes the opening <juiceboxgallery> tag.
Change:

captionBackColor="rgba(0,0,0,0.1)">
showImageNumber="false"

... to:

captionBackColor="rgba(0,0,0,0.1)"
showImageNumber="false">