When JuiceboxBuilder resizes a PNG file, it converts it to a JPG file and transparent regions are rendered as black in the main image but white in the thumbnail. The developers are aware of this inconsistency and it has been logged as a bug.

When choosing not to resize PNG images (by deselecting the 'Resize Images' checkbox on the 'Images') tab, the original PNG images are copied across to the gallery's 'images' folder (unprocessed) but with an incorrect '.jpg' file extension. This has also been logged as a bug.
To regain transparency, you'll need to rename the file extensions in the 'images' folder from '.jpg' to '.png' and also change the file extensions in the corresponding imageURL entries in the gallery's 'config.xml' file.
Please note that the thumbnails (in the 'thumbs' folder) will have been converted to JPG files (with transparent regions rendered as white). If you like, you can just use the imageURL paths (after correcting the file extensions) for the thumbURL entries by manually editing the 'config.xml' file. Juicebox will dynamically scale the images when the gallery is displayed and you'll have transparency in both the main images and thumbnails.

I realise that this is inconvenient and adds a few extra steps to your workflow but, until the bugs are fixed, it is at least still possible to display PNG files with transparency in a Juicebox gallery (with a bit of work).

Both of the PNG related issues above have been logged as bugs and should be fixed in a future version (but, unfortunately, I do not know exactly when this might be).

When you use a watermark in JuiceboxBuilder-Pro, the watermark is baked into the image itself when the image is resized for the gallery. The idea is that wherever the image goes, the watermark goes, too. It's usually used as a deterrent to discourage people from downloading your images.
As such, the watermark itself cannot be moved from the image to somewhere else in the gallery.

However, you can add an image (such as a watermark image) to your gallery in several other ways.
Please see the Adding a Logo support section for a couple of suggestions.
Perhaps the best suggestion would be to use the Gallery Title (suggestion #3 in the link above). If you set galleryTitlePosition="TOP", then you can also set topAreaHeight to a value large enough to ensure that the image you use does not overlap the main images in your gallery.

If you just wanted to include some copyright text, then you could either use the Gallery Title or the image titles and captions.
Image titles and captions can be multi-line so if you already have a caption for an image, you can add a couple of HTML line breaks and then your copyright text to the end of an existing title. For example, you could enter a caption such as:

This is the image caption.<br><br>Copyright © 2017 Me

Please try the suggestions in this forum post.
I expect the most likely cause is a either going to be a conflicting plugin such as a security or caching plugin (Suggestion #2) or an entry in a .htaccess file preventing the plugin's PHP pages from being accessed directly (Suggestion #5).

I hope this helps.
However, if you continue to experience difficulties, please post back with some more details about your problem such as when exactly does the error message occur (e.g. when clicking the 'Add Juicebox Gallery' button or accessing the 'Manage Galleries' page or viewing the gallery).
If you could perhaps provide a screenshot so that I can see what you are seeing, then that might also help.
Thank you.

Unfortunately, what you are looking to do might not be possible. When a gallery is expanded to fill either the browser window or the entire screen, only the gallery itself (essentially the 'juicebox-container' <div>) is displayed. The code which handles the gallery expansion is buried deep within the 'juicebox.js' JavaScript file which is obfuscated and cannot be modified.

The only way to do something like this would be to set expandInNewPage="TRUE" (in the General Options section), a Juicebox-Pro option which is not supported by Juicebox-Lite.

This will force the gallery to be expanded in a new web page (instead of on top of the embedding page or triggering the Fullscreen API to cover the entire screen). The web page that is used when the gallery is expanded in this way is the 'full.html' file within the gallery's 'jbcore' folder.
You could then modify this HTML file to change the gallery's dimensions (reduce the size of the gallery from 100% x 100% to allow room for your own custom content) and add your own HTML code in a custom <div> alongside the gallery.

I expect that this should work but please note that this is untested and modification of the 'full.html' file is not officially supported so you would do so at your own risk. (You may run into unforeseen problems that might need to be tackled along the way.) Also, there is no way for the 'full.html' file to be used in conjunction with the Fullscreen API so when the gallery is expanded, it will fill only the browser window and not the entire screen.

You're welcome!
Hopefully you'll find that it works fine (as it does when I try it in my browser's developer tools).

You can set the colors for the thumbnail dots only in Juicebox-Pro (via the thumbDotColor and thumbDotHoverColor Color Options). Unfortunately, these options are not supported by Juicebox-Lite (the free version).

It would be possible to not use thumbnails at all by setting showThumbsOnLoad="FALSE" (for Large Screen Mode) and showSmallThumbsOnLoad="FALSE" (for Small Screen Mode) and disabling the Thumbnail Button by setting showThumbsButton="FALSE" and showSmallThumbsButton="FALSE") but, again, these Thumbnail Options are Pro only.

You're welcome.

No problem. I've written a bit more about all three products in this forum thread.

Juicebox-Pro and SimpleViewer-Pro galleries both support audio for details.
Check out the Juicebox-Pro Adding Audio support section.

Juicebox-Pro Audio Options: https://www.juicebox.net/support/config … io-options
SimpleViewer-Pro Audio Options: https://simpleviewer.net/simpleviewer/p … html#audio

Neither Juicebox-Pro not SimpleViewer-Pro support videos (please see the FAQs below) but you can certainly embed videos into Showkase pages. Here's a demo Showkase page featuring multiple videos.
Please see this forum post for more details on how to add videos to Showkase pages.

Juicebox-Pro FAQ: Will Juicebox load things other than images?
SimpleViewer-Pro FAQ: Will SimpleViewer load things other than images?

It is not possible to add slow, medium and fast buttons to a gallery but you can set the display time (the time each image is displayed for before the next transition) via the displayTime configuration option (in JuiceboxBuilder-Pro's 'Customize -> AutoPlay' section). You can also set the image transition time (the length of time that each transition between images should last) via imageTransitionTime ('Customize -> General').

Set flickrImageCount="500" in the Pro Options text area.
The default value is 50 and the maximum value if 500 (this maximum limit is imposed by Flickr rather than Juicebox-Pro).
For reference, the Flickr Pro Options can be found here.
This should hopefully resolve your problem.

Pretty much... When the images are returned via the API, the array contains certain data along with the image URL.
I listed the data that could be useful in sorting the images. There are certain other attributes attached to each image but they would be much less useful in sorting such as the image type (e.g. "image/jpeg").
The display order for each image is not stored as array values.

The images should be returned (and displayed by WP-Juicebox) in the display order (according to Google's own documentation - see the quote in my post above) and, unfortunately, if the images are returned in a different order, then there is little that WP-Juicebox can do to re-order the images other than manually sort the array using whatever attributes are available.

I realise that you already use Google Photos but if you want to have more control over the order of images in your WP-Juicebox galleries, then you might like to try using a different image source (such as the WordPress Media Library or Flickr). It would be much easier to re-order images using either of these sources.

I expect the 'updated' date would be the time that you last edited a particular image. (I notice that in my own test album, each image has a different 'updated' date so 'updated' seems to refer to individual images rather than the gallery as a whole.)

You could certainly do that (or you could add alphabetical or numerical descriptions to all your images, sort by 'summary' and then tweak the WP-Juicebox code to prevent these image captions from being displayed in the gallery) but it would probably be quicker and easier to just re-upload the images to either the WordPress Media Library or Flickr and use the built-in sorting methods that these alternative image sources offer.

I see that the 'Photos' section of your website contains many photo galleries (listed under year headings).
I do not know how you are building your site (manually or with a web design program) but we have another software package named Showkase which you might be interested in.

Showkase is a PHP web application which allows you to create a complete portfolio web site (integrating multiple galleries) online.
Showkase has full support for Juicebox-Pro (and SimpleViewer-Pro) and the galleries can be created and managed within the application itself in a web browser interface. (Alternatively, you could continue to create Juicebox-Pro galleries with JuiceboxBuilder-Pro and then import them into a Showkase site.)

You can create Gallery Index pages (perhaps one per year as your current site does) 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 (showing the different themes available) 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.

Please feel free to 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 and SimpleViewer-Standard, the free versions) or Showkase-Pro (which comes with Juicebox-Pro and SimpleViewer-Pro). The only difference between Showkase-Standard and Showkase-Pro is the bundled viewers.

As you already have Juicebox-Pro, you could purchase Showkase-Standard and integrate your Juicebox-Pro files by following the Installing a Pro Viewer instructions.

Just some food for thought that might make life a little easier if you are currently building and maintaining your web site by hand.

It might not be easy to seamlessly integrate text next to a Button Bar button but there is already rollover tooltip text associated with each button. When you mouse over the Thumbnail Button, the text 'Show Thumbnails' or 'Hide Thumbnails' (depending on the current thumbnail status) appears. If you like you can change this text via the languageList configuration option.

If you really wanted to display the text 'Toggle Thumbs' below the Thumbnail Button (for example), then you could try something like this:

<!--START JUICEBOX EMBED-->
<script src="jbcore/juicebox.js"></script>
<script>
    var jb = new juicebox({
        containerId: "juicebox-container",
        showThumbsButton: "TRUE",
        showThumbsOnLoad: "FALSE"
    });
    jb.onInitComplete = function() {
        $('.jb-bb-btn-de-show-list').append('<p style="font-family: sans-serif; font-size: 14px; padding-top: 10px; text-align: center;">Toggle Thumbs</p>');
    };
</script>
<div id="juicebox-container"></div>
<!--END JUICEBOX EMBED-->

I hope this helps.

Set showThumbsOnLoad="FALSE" in JuiceboxBuilder-Pro's 'Customize -> Thumbnails' section to initially hide the thumbnails.
You can also set showSmallThumbsOnLoad="FALSE" to initially skip the thumbnail page and go straight to the first image when the gallery is displayed in Small Screen Mode.

For reference, a list of all Thumbnail Options can be found here.