If you are trying to incorporate your own original functionality (switching between different galleries with different heights) and functionality from your forum thread here (to allow different thumbnails configurations depending on the width of the browser window) and also this functionality (changing the height of the galleries depending on the height of the browser window), then things are starting to get really complicated. There is the added complication that setGallerySize() accepts only fixed pixel values and does not accept percentages so you might want to reload the selected gallery with new dimensions (rather than use setGallerySize()) if you want to retain gallery widths of 100%.

Assuming you want both your galleries to be the same size as each other (which is not currently the case) but want their heights to change when a threshold height is crossed, then try replacing:

               <script>
    $(document).ready(function() {
        //load gallery 1
        loadGallery('colStonewareBrickSets/', '650px');
        //initialize top buttons
        $("#button-1").on("click", function(){loadGallery('colStonewareBrick/', '500px');});
        $("#button-2").on("click", function(){loadGallery('colStonewareBrickSets/', '650px');});
    });

    function loadGallery(base, height) {
        new juicebox({
            baseUrl: base,
            containerId: 'juicebox-container',
            backgroundColor: 'fff',
            galleryWidth: '100%',
            galleryHeight: height
        });
    }
          </script>

... with:

<script type="text/javascript">

    var jb;
    var a, b, c; // maxThumbColumbs, maxThumbRows, thumbsPosition
    var y = 'colStonewareBrickSets/'; // Initial baseUrl
    var z; // galleryHeight
    var galleryHeightLarge = '800';
    var galleryHeightSmall = '400';
    var size;
    var thresholdHeight = 480;
    var thresholdWidth = 700;
    var tracker = false;

    function loadGallery(a, b, c, y, z) {
        jb = new juicebox({
            containerId: "juicebox-container",
            baseUrl: y,
            galleryHeight: z,
            galleryWidth: '100%',
            maxThumbColumns: a,
            maxThumbRows: b,
            thumbsPosition: c
        });
        tracker = true;
    }

    function initialLoad() {
        var windowWidth = window.innerWidth ? window.innerWidth : $(window).width();
        var windowHeight = window.inneHeight ? window.inneHeight : $(window).height();
        if (windowWidth < thresholdWidth) {
            a = '10'; // maxThumbRows
            b = '1'; // maxThumbColumns
            c = 'BOTTOM'; // thumbsPosition
        } else {
            a = '3'; // maxThumbRows
            b = '3'; // maxThumbColumns
            c = 'LEFT'; // thumbsPosition
        }
        if (windowHeight < thresholdHeight) {
            size = "SMALL";
            z = galleryHeightSmall; // galleryHeight
        } else {
            size = "LARGE";
            z = galleryHeightLarge; // galleryHeight
        }
        loadGallery(a, b, c, y, z);
    }

    function checkSize() {
        var windowWidth = window.innerWidth ? window.innerWidth : $(window).width();
        var windowHeight = window.inneHeight ? window.inneHeight : $(window).height();
        if (windowWidth < thresholdWidth && c === 'LEFT') {
            a = '10'; // maxThumbRows
            b = '1'; // maxThumbColumns
            c = 'BOTTOM'; // thumbsPosition
            loadGallery(a, b, c, y, z);
        }
        if (windowWidth >= thresholdWidth && c === 'BOTTOM') {
            a = '3'; // maxThumbRows
            b = '3'; // maxThumbColumns
            c = 'LEFT'; // thumbsPosition
            loadGallery(a, b, c, y, z);
        }
        if (windowHeight < thresholdHeight && size === 'LARGE') {
            z = galleryHeightSmall;
            size = 'SMALL';
            loadGallery(a, b, c, y, z);
        }
        if (windowHeight >= thresholdHeight && size === 'SMALL') {
            z = galleryHeightLarge;
            size = 'LARGE';
            loadGallery(a, b, c, y, z);
        }
    }

    $(document).ready(function() {
        initialLoad();
        $(window).resize(checkSize);
        $("#button-1").click(function() {
            y = 'colStonewareBrick/'; // baseUrl
            loadGallery(a, b, c, y, z);
        });
        $("#button-2").click(function() {
            y = 'colStonewareBrickSets/'; // baseUrl
            loadGallery(a, b, c, y, z);
        });
    });

</script>

If you want to do things that Juicebox-Pro was not designed to do (and perhaps make use of the Juicebox-Pro API for certain things, too), then I would certainly recommend taking a look at learning JavaScript. It's really the only way to achieve the things you are asking.
There's a good guide to JavaScript on the Mozilla Developer Network here.
I hope this points you in the right direction.

Incidentally, you could ensure that your galleries are responsive (please see this forum post for details) but this would mean that you would essentially have no control over the shape or size of your gallery (it would be entirely dependent on the shape and size of the user's browser window) and there may very well be gaps above and below (or to the left and right of) the main images in the gallery.
Having two fixed heights (like in the code above) which work well for the most popular browser window shapes and sizes of your target audience might be the best compromise.

The languageList for Juicebox-Pro v1.5.0 is as follows:

"Show Thumbnails|Hide Thumbnails|Expand Gallery|Close Gallery|Open Image in New Window|Images|Next Image|Previous Image|Play Audio|Pause Audio|Show Information|Hide Information|Start AutoPlay|Stop AutoPlay|AutoPlay ON|AutoPlay OFF|Go Back|Buy this Image|Share on Facebook|Share on Twitter|Share on Google+|Share on Pinterest|Share on Tumblr|of|Send Email|Download"

The two new entries at the end "Send Email" and "Download" refer to the Email Button (showEmailButton) and the Download Button (showDownloadButton) respectively.

The International Gallery Text support section has now been updated to reflect this change.

Please note that, unfortunately,  there is currently a problem with the "Download" entry (which always uses the default text of "Download").
A bug report has been logged with the developers and it should hopefully be fixed in the next version.
Apologies for any inconvenience.

There are no configuration options that could be used to achieve this but it could be done with JavaScript as follows.

<script type="text/javascript" src="jbcore/juicebox.js"></script>
<script type="text/javascript">

    var a, b, c;
    var thresholdWidth = 700;
    var tracker = false;

    function loadGallery(a, b, c) {
        new juicebox({
            containerId: "juicebox-container",
            maxThumbColumns: a,
            maxThumbRows: b,
            thumbsPosition: c
        });
        tracker = true;
    }

    function thumbsStatus() {
        var windowWidth = window.innerWidth ? window.innerWidth : $(window).width();
        if (windowWidth < thresholdWidth && (c === 'LEFT' || tracker === false)) {
            a = '10'; // maxThumbRows
            b = '1'; // maxThumbColumns
            c = 'BOTTOM'; // thumbsPosition
            loadGallery(a, b, c);
        }
        if (windowWidth >= thresholdWidth && (c === 'BOTTOM' || tracker === false)) {
            a = '3'; // maxThumbRows
            b = '3'; // maxThumbColumns
            c = 'LEFT'; // thumbsPosition
            loadGallery(a, b, c);
        }
    }

    $(document).ready(function() {
        thumbsStatus();
        $(window).resize(thumbsStatus);
    });

</script>

I hope this helps.

The order of preference that the Download Button uses is as follows.
It will use the linkURL if it exists. If there is no linkURL, then it will use the largeImageUrl. If there is no largeImageUrl, it will use the imageUrl.
The linkURL is first in preference to allow custom files associated with the images (such as .pdf or .zip files) to be downloaded instead of the images themselves.

That's really the concept behind a Multi-Size Image gallery (that larger images are displayed on larger resolution screens).

It sounds like you're looking to have a single-size image gallery but also have larger images available for download.
Assuming you are allowing JuicboxBuilder to resize your source images and want to use the source images for the Download Button, then this could be achieved as follows.

(1) Create a regular single-size image gallery with JuiceboxBuilder, allowing the application to use the same values for the imageURLs and the linkURLs (which is the default behavior).

(2) Copy your source images (the ones you fed to JuiceboxBuilder to create the gallery) into a new empty folder named 'originals' and place this folder into your gallery folder (alongside the 'images' folder).

(3) Edit your gallery's 'config.xml' file and change all instances of linkURL="images/ to linkURL="originals/.
If you use a text editor such as Notepad++ (free), you can change all instances in a single global search and replace action. It should take less than a minute to edit the file from start to finish.

I hope this helps.

If you are looking to do something with Juicebox that is not currently possible, please feel free to post your ideas in the Feature Requests forum thread.
This keeps all the ideas together and ensures that they are not overlooked by the developers.
Thank you.

Unfortunately, there is a known bug in JuiceboxBuilder whereby an error can be generated if the resize image dimensions are too large.
The exact dimensions can vary depending on the source images but, under certain circumstances, JuiceboxBuilder can fail (displaying the error message you quoted) if 'Max Width' and 'Max Height' are both greater than 2364.
However, the developers are aware of this issue and are currently investigating it.
Hopefully it will be fixed in a future version.

The password protection functionality requires server-side code (PHP) and works only when the gallery has been uploaded to a web sever.
Please see the Password Protection support section for details.

You could use an image title such as the following (lowercase 'L' in Wingdings is the character you are looking for).

<span style="font-family: Wingdings; font-size: 24px; color: #ff0000;">l</span>

However, this will display as intended only in Microsoft browsers (Edge and Internet Explorer) and only if Wingdings is installed on the user's computer.

It would be much better to use a Unicode character so that it can be seen correctly in all browsers.
You can display a Unicode character in a web page using its decimal code or hexadecimal code.

Please see this web page for a table of Windings characters and their Unicode equivalents. Look for the lowercase 'L' in the first column in the table for the Unicode codes you'll need to use.
You can use either of the following in an image title to display a big red dot.

Decimal:

<span style="font-size: 24px; color: #ff0000;">&#9679;</span>

Hexadecimal:

<span style="font-size: 24px; color: #ff0000;">&#x25CF;</span>

Please also see this FAQ regarding using HTML formatting in image titles and captions.
How do I add HTML formatting to image captions and titles?

You can download the latest version of WP-Juicebox (v1.5.0) from the plugin's support page here. (WP-Juicebox is not included in the Juicebox-Pro zip package.)
Install the plugin following the Installation Instructions (in the link above) and upgrade it to Juicebox-Pro (using the 'jbcore' folder from your Juicebox-Pro v1.5.0 zip package) by following the Upgrading to Juicebox-Pro instructions.

Essentially:
(1) Download WP-Juicebox v1.5.0.
(2) Replace the plugin's 'jbcore' folder with the one from your Juicebox-Pro v1.5.0 zip package.
(3) Upload the 'wp-juicebox' folder to your WordPress 'wp-content/plugins/' directory, overwriting your existing 'wp-juicebox' folder.

After doing this, you will have the latest version of both WP-Juicebox and Juicebox-Pro.

It looks like the problem is with your Picasa User Id and/or Picasa Album Name.

Check that the functionality is working OK by setting up a test gallery with the following information:
Picasa User Id: picasateam
Picasa Album Name: VegasWeekend

Please check your Picasa User Id. It may not be your email address.
Also, as Google have discontinued Picasa and are moving all Picasa web albums over to Google+ photo albums, you might need to enter Google credentials rather than Picasa ones.

You can find your Google User Id by logging in to Google+ and clicking the 'Google+ Profile' link above the 'My Account' button (after clicking your custom image at the top right). Your Google User Id will be the 21 digit number in the URL (in your browser's address bar).

Take a look at this forum thread which should hopefully point you in the right direction towards finding your Google Album Id (a 19 digit number).

I hope this helps.

You're welcome.
I'm glad you've got it working.

PHP 5.4.35.

Have you tried my 3 suggestions above yet to see if any of them make a difference?

Creating Juicebox galleries with WP-Juicebox v1.5.0 and NextGEN v2.1.43 seems to work OK on my own server with WordPress 4.5.2 (and PHP 5.4.35) so the problem may somehow be related to your own setup (your current theme, activated plugins, PHP version, server settings).

Unfortunately, as I am currently unable to replicate the problem, it makes troubleshooting quite difficult.

I would certainly try reverting to a default WordPress theme and deactivating all plugins (including all CDN and caching plugins) other that WP-Juicebox and NextGEN to see if this helps.

The captionPosition in this gallery is BELOW_IMAGE.
The Info Button only toggles elements positioned on the overlay (captionPosition="OVERLAY" or captionPosition="OVERLAY_IMAGE").
When captionPosition is BELOW_IMAGE, BOTTOM or BELOW_THUMBS, the captions will always be visible (and not toggled via the Info Button).