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You might have a couple of different issues going on here.
Hopefully my notes below will help.

This is a message which appears when running Showkase v1.7.0 (or earlier) under PHP 7.1 (or later).
It sounds like your new web server may be running PHP 7.1 or 7.2 (and this is why you are seeing this message for the first time with your Showkase v1.6.1 site).
Showkase was updated to be compatible with PHP 7.1 and 7.2 in Showkase v1.7.2.

Did you actually try running Setup (rather than just checking the path on the Setup page)?
Running Setup is a crucial step when moving or renaming your Showkase installation (as noted here).

I would try upgrading your Showkase site (full instructions here) to the current version (v1.7.3) and running Setup.
If this does not work, then it might be quicker to recreate the site.
If you create a fresh Showkase installation on your web server, you can then:

(1) Retain the Showkase settings from your original site by manually copying the following files and folders from your original site to your new site (overwriting the default versions which will be in place after a fresh install).

• _data/sitedata (folder)

• _data/themedata (folder)

• _data/pagesprefs.txt (file)

• _data/theme.txt (file)

Do not copy the _data/pagesdata.txt file though, as this lists the pages present in each site (which will be different after a fresh install).

Also, if you use a custom logo via an image stored in the library, for example, then you might also like to copy the '_library' folder from your original site to your new site.

(2) Import all the pages from your original site (via 'Site -> Import') to save having to recreate all your pages from scratch. You can import multiple pages at once so recreating your original site should be relatively quick and easy.

Hopefully upgrading Showkase and running Setup will work for you but the procedure above should also work fine as a backup plan.

Just be sure to create a full backup of your site before you try anything (just in case anything goes wrong and you need to reinstate your original files at a later date).

You can add the code (without the <script> tags) to your theme's 'custom.js' JavaScript file and it will be included (and run) in all your Showkase pages.

For example, if you use the Boma theme, then add the following code (changing the 2 instances of UA-XXXXXXXX-X to your own Google Analytics ID) to your site's '_themes/boma/js/custom.js' file.

var gaProperty = 'UA-XXXXXXXX-X'; 
var disableStr = 'ga-disable-' + gaProperty; 
if (document.cookie.indexOf(disableStr + '=true') > -1) { 
    window[disableStr] = true;
} 
function gaOptout() { 
    document.cookie = disableStr + '=true; expires=Thu, 31 Dec 2099 23:59:59 UTC; path=/'; 
    window[disableStr] = true; 
    alert('Das Tracking ist jetzt deaktiviert'); 
} 
(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){ 
        (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o), 
    m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m) 
})(window,document,'script','https://www.google-analytics.com/analytics.js','ga'); 

ga('create', 'UA-XXXXXXXX-X', 'auto'); 
ga('set', 'anonymizeIp', true); 
ga('send', 'pageview'); 

I hope this helps.

If you really want to hide the caption area in Small Screen Mode, you could try adding the following code to your theme's 'custom.js' file, e.g. '_themes/boma/js/custom.js':

jb.onInitComplete = function() {
    var screenMode = jb.getScreenMode();
    if (screenMode === "SMALL") {
        $('.jb-area-caption').remove();
        jb.onExpand = function(expanded) {
            if (expanded) {
                setInterval(function() {
                    $('.jb-area-caption').remove();
                }, 500);
            }
        };
    }
};

It's pretty clunky and not at all a nice clean solution but it might at least give you a starting point to work with.

That's probably normal. In Small Screen Mode, the captions will be on the overlay (resting at the bottom of the screen). The images themselves will, by default, be vertically-centered so the caption text may not always be overlaid on top of the images, especially if you have a landscape image being displayed on a device in portrait orientation (where there will likely be space above and below the image). I hope that makes sense.

Unfortunately, there are no configuration options available that you could use to do this.
You'd need to maybe use CSS media queries (in your site's 'custom.css' file) or the Juicebox-Pro API (specifically the getScreenMode() method) to detect when Small Screen Mode is being used to display the gallery (in your site's 'custom.js' file) and then hide the caption area, if appropriate to do so, via CSS (although it's not something I've tried so I don't know how successful it would be).

As long as your Juicebox-Pro gallery sets screenMode to AUTO (and allows Juicebox to determine the most appropriate Screen Mode for the device being used to view the gallery), then Small Screen Mode will be used on mobile devices where the captions will always be displayed on the overlay (on top of the image, where they can be toggled on and off with a tap to the screen).
captionPosition is a Large Screen Mode only configuration option. (It is ignored in Small Screen Mode.) If screenMode is set to LARGE (to force the gallery to be displayed in Large Screen Mode in all browsers and on all devices), then the captionPosition value will be used in all circumstances (across all browsers and devices).
(More information about Juicebox and Screen Modes can be found here.)

Please check out the Changing Your Installation Directory instructions. This should hopefully help.

If you run into any problems, you can always create a fresh Showkase site on your new domain and then:

(1) Retain the Showkase settings from your original site by manually copying the following files and folders from your original site to your new site (overwriting the default versions which will be in place after a fresh install).

• _data/sitedata

• _data/themedata

• _data/pagesprefs.txt

• _data/theme.txt

Do not copy the _data/pagesdata.txt file though, as this lists the pages present in each site (which will be different after a fresh install).

Also, if you use a custom logo via an image stored in the library, for example, then you might also like to copy the '_library' folder from your original site to your new site.

(2) Import all the pages from your original site (via 'Site -> Import') to save having to recreate all your pages from scratch. You can import multiple pages at once so recreating your original site should be relatively quick and easy.

Hopefully the 'Move or Rename Installation' instructions will work fine for you but the procedure above should also work fine as a backup plan.

What demo are you referring to?

With Showkase, you can have only one Juicebox gallery embedded per Juicebox gallery page but you can have an unlimited number of galleries listed on a Gallery Index Page (each represented by a thumbnail image).
To create a Gallery Index Page, go to the 'Pages' tab, click the '+ New Page' button and select 'Gallery Index Page'.
To list a gallery on the Gallery Index Page, just drag and drop the gallery page onto the Gallery Index Page in the tree on the left hand side of the 'Pages' tab (and then click 'Save' and 'Publish').
By default, the first image in the gallery will be used as the representing thumbnail image on the Gallery Index Page.
If you'd like to choose a different image, 'Edit' the gallery page (from the 'Pages' tab), go to the 'Images' tab and select the image you'd like to use in the 'Index' column (and then click 'Save' and 'Publish').

Boma is a theme which features a side menu.
If you want to try to customize a theme to match the website you quoted (which has a top menu), then it would be much easier to start with a Showkase theme which features a top menu, such as Kosel. Here's an example of a site using the Kosel theme.
The white backgound would be easy to achieve by going to 'Site -> Customize Theme -> Color Scheme' and selecting 'light' (rather than the default 'dark' for Kosel).
You could then create a Gallery Index Page and use this as your home page by making sure that the page it as the top of the tree on the 'Pages' tab (by dragging and dropping it there, if necessary).

The web site you quoted uses completely different code to that which Showkase generates so it's not going to be easy to replicate exactly (even with a customized theme).
If you want to customize a theme beyond what is possible within the Showkase interface, then please take a look at the Customization support section and the Creating Themes documentation but please note that creating a new theme (or modifying an existing theme manually) would require an in-depth knowledge of HTML, CSS and JavaScript.
However, I hope my notes above at least point you in the right direction to get started.

That's certainly a bug. Thank you for reporting it.
I'll let the developers know right away.

In the meantime, it looks like it should be able to be fixed by a quick edit to one of the Showkase files.
Open the 'showkase\admin\plugins\library\librarygallery.inc.php' file in a plain text editor, scroll down to line 72 and change:

function saveGallery()

... to:

function saveGallery($checkThumb = false)

This should hopefully resolve the problem.

Apologies for any inconvenience caused. We'll get this bug sorted out as soon as we can.
Thanks again for letting us know.

Thank you for providing the screenshot.

In the screenshot, there really is not enough room to display a 4th thumbnail on the 1st row (so Showkase wraps the 4th thumbnail onto the 2nd row).
Here's a mock-up (click here for screenshot [Link removed.]) of how the page would look with a 4th thumbnail in place.

The thumbnails are responsive but they will reach a maximum size and will not continue to scale up to exactly fill the available page width. (They will not be scaled up beyond their actual size as this would degrade their visual quality.)
I think it would be very difficult to change the way the the gallery index page thumbnails are scaled in the Showkase source code. I expect you'd need to change several files, knowledge of PHP and CSS would likely be necessary and you may encounter problems (such as with breakpoints) along the way.
You are certainly welcome to try but I'd recommend sticking with the way that Showkase currently works.

Having said that, you could try changing the dimensions for the thumbnails (to compensate for your increased page width) via the ss_totalIndexThumbWidth value in the '_themes\base\theme.ini' file (on line 27). (Please note that the line number refers to the current version of Showkase, v1.7.2.)
This might help to space out your thumbnails a little better to give a more balanced looking page layout.
Be sure to republish your site after making any changes.

What you are describing is the Splash Page.

The Splash Page is a placeholder for the gallery which is displayed by default on small screen devices when the gallery is embedded in a web page alongside other content (rather than displayed on a page of its own with dimensions of 100% x 100%, filling the browser window) and may may too small to be usable.
The Splash Page is essentially an image link for the gallery which displays an image (by default, the first image in the gallery) and some text.
When the user clicks or taps the Splash Page, the gallery is expanded to fill the browser window (giving the images more space to be displayed).

More information about the Splash Page can be found in the Screen Modes section of the Gallery Tour.

You can choose to not use the Splash Page by setting showSplashPage="NEVER" ('Splash Screen (Pro)' section). Using this setting, the Small Screen Mode thumbnail page would initially be displayed instead of the Splash Page on small screen devices.
Alternatively, you could force the gallery to be displayed in Large Screen Mode (which, by default, does not use the Splash Page) on all devices and in all browsers by setting screenMode="LARGE" ('General (Pro)' section).

For reference, all the Splash Page configuration options can be found here.

As long as PHP v5.2.0 or later is installed and configured correctly on the web server (as noted in the System Requirements here), Showkase should actually be a very quick and easy application to install.
For reference (and other users reading this forum thread), instructions for installing Showkase can be found here.

Just to clarify, after uploading the Showkase file to your web server, you should open the 'showkase/admin/index.php' file in your browser (just going to 'showkase/admin/' should be fine) and the setup page should be displayed.

If you are getting an error 403 (forbidden) message, then it sounds like the Showkase files on your web server might have permissions which are too restrictive. Default permissions of 644 for files and 755 for folders should be fine. You should be able to check and change file permissions using a dedicated FTP program such as Filezilla or via your web hosting account's online file manager.
Please also see this FAQ:
I’m getting error messages when I try to install Showkase

No. Showkase-Standard comes bundled with Juicebox-Lite and Showkase-Pro comes bundled with Juicebox-Pro.
Whichever version of Showkase you have, there is no need to use any files other than the Showkase zip file to get Showkase up and running.

No. Showkase is a PHP web application and needs to be installed on a web server. It cannot be run on a desktop computer.
(Technically, you could setup a PHP environment on your computer using a program such as MAMP or XAMPP but this is not something that I would recommend.)

If you are seeing all the PHP code in the browser window, then it looks like PHP may not be installed or configured correctly on your web server. Please double-check with your web host that PHP is active and working correctly on your web hosting account. It looks very much like there's a problem with PHP on your web server and your web host should hopefully be able to help you out with this.

I hope these notes point you in the right direction.
However, if you continue to experience difficulties, then please let me know and I'll do my best to help you out further.
It might also help if I had access to your web server to check things out myself. If you are agreeable to this, then please let me know and I will send you an email where you can forward me your FTP login details.
Thank you.