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As far as I am aware, the Hierarchy Request Error is a PHP DOMDocument error which occurs when trying to move a node into itself, although I do not know why this error is generated when you try to publish your gallery.

We know that Showkase works OK on your web server (as you have a second working Showkase site) and we also know that all the core Showkase files are present and correct (as you have tried re-uploading them, overwriting the existing ones) so the problem may lie with one (or more) of your Showkase pages. With this in mind, you might like to try the following.

*** Please make a full backup of your entire Showkase site before proceeding. ***

Try trashing your Showkase pages on the 'Pages' tab, one by one (starting with the last one you created and working backwards), and try to Publish your site each time to see if the Hierarchy Request Error still occurs.
(When trashing a page, it will be moved into the '_trash' directory. You can reinstate a trashed page using the 'Site -> Import' functionality.)
If you find a page which is causing the problem, you could recreate it manually and reinstate all others using the 'Site -> Import' functionality.

Unfortunately, I do not know what may be causing your problem but a possible workaround would be to create a completely new Showkase site and use the 'Site -> Import' functionality to import all existing pages from the currently broken Showkase site. This might be a relatively quick option to get your site up and running again without having to create all your pages from scratch.

Just to check, are both Showkase sites in completely separate directories? (I would not recommend nesting one Showkase directory within another Showkase directory.)

Your video is embedded on a 'Basic' page but you have grouped this page under the 'Videos' page which is a 'Gallery Index' page. Therefore, you need to click the 'Videos' link in the menu to see all pages grouped under the main 'Videos' page. You can then click the link to the 'Basic' page.

If you want the page your video is on (the 'Basic' page) to be a top level page (not grouped under any other pages), then edit the page and select 'none' for 'Group Under' in the 'Site Navigation section'. You can then delete the 'Videos' (Gallery Index) page and rename the 'Basic' page to 'Videos'.

Also, only gallery thumbnails (for Juicebox, ListViewer and SimpleViewer pages) are displayed on a 'Gallery Index' page and you have no galleries grouped under the 'Videos' page which is why nothing is displayed on the 'Videos' page itself. (It is not possible to automatically create a thumbnail page for videos like you can for image galleries.)

The background image you have set up for your 'Basic' page (Blank_Web.jpg) displays on you 'Basic' page as expected.
If you do not see this, then try clearing your browser's cache before reloading the page.

I'm glad that worked. Thank you for posting back to let me know.

I see the problem you describe in your DE and FR sites (but have not been able to replicate the problem in a test site of my own).
It certainly looks like a CSS problem which may be caused by a mixture of old and new files (perhaps one or more of the updated Showkase files did not overwrite existing files on your web server during the upgrade).
Try re-uploading all the '_themes' files from the Showkase v1.4.0 download zip package to your DE and FR Showkase installations on your web server to ensure that all files are present and correct. Hopefully this will help.
(If you have modified any '_themes' files or have edited any 'custom.css' files, please make a backup of them first before replacing them on your web server.)

@gustavocampos1

The 'Base font size (px)' in the interface goes up to only 16. All values set within the interface should result in a layout that looks OK.

Adding custom CSS can cause knock-on effects that might need to be resolved (as you have discovered).

If you find that your text is not being displayed in its entirety, then you may need to expand the container it is in with further CSS rules.

If the problem you are having is that you are using the Kosel theme and the top of the menu text is disappearing, try adding the following to your '_themes/kosel/css/custom.css' file:

nav ul {
    padding-top: 5px;
}

If this does not help, then please post the URL to your web site so that I can take a look and help further.

Incidentally, if you are not already using the current version of Showkase (v1.3.0), you can upgrade following the instructions here.

Did you add your site header logo to your Showkase Library ('Library -> Upload') and select it (in the 'Site -> Customize Theme' section) using the 'Browse' button or did you enter a URL manually? If you entered a URL manually, please make sure that the URL is an absolute path (in the form http://www.example.com/images/image.png) so that it is a valid path from any web page.

I have been unable to replicate your problem using the Library method so if you have not already tried this, please do so.
If you continue to experience difficulties, then please post the URL to your Showkase site so that I can take a look and help further.

It looks like your gallery might have been given fixed dimensions before it became part of a svManager or Showkase management system.

Here are a few things to try:

Make sure that you are using Showkase's 'Gallery Manager' theme ('Site -> Change Theme -> Gallery Manager') which displays galleries at 100% x 100% (filling the entire browser window, or in your case, your iframe).
If you are already using this theme, then try changing the theme to something different ('Boma' or 'Kosel') and then change it back to 'Gallery Manager'.

Now that your 'g2' gallery is part of Showkase, you could try rebuilding the gallery (edit the Juicebox Gallery page and go to 'Advanced -> Rebuild this Juicebox gallery').

Although the 'g2' gallery is already part of Showkase, it looks to have been originally part of svManager and became part of Showkase during the upgrade.
You could try importing the gallery into Showkase using the 'Site -> Import' functionality (to create a new Showkase page from the gallery) and then load this new page into your 'iframe'.

If none of the above automated suggestions work, then try opening your http://coromandelflavour.co.nz/showkase/g2/index.html page directly in a plain text editor and manually change the gallery width and height both to 100%.

A further solution (though not as clean as simply setting your gallery's dimensions to 100% x 100%) would be to add the following code to your 'showkase/_themes/manager/css/custom.css' file:

body.type-juicebox {
    margin: 0 !important;
}

... to ensure that the margin on your page (visible when viewing http://coromandelflavour.co.nz/showkase/g2/index.html) is not displayed within the iframe.

One of these suggestions should hopfully solve your problem.

Each theme uses its own default settings.
To reset the Kosel theme's Juicebox settings (for example), delete the 'showkase/_data/themedata/kosel/juicebox.xml' file.

Rather than load the gallery into an iframe within a Showkase page, you could import the gallery into Showkase (and give the gallery its own Showkase page) by using the 'Site -> Import' functionality. This would allow you to manage the gallery within the Showkase interface and should also hopefully solve your problem with the space on your web page.

If this does not help (or you do not want to import the gallery), then please post the URL to your web page so that I can take a look and help further.

Unfortunately, there is no quick and easy way to reset all Juicebox gallery settings to their default values within Showkase.
If you change gallery configuration options at theme level (under 'Site -> Customize Viewers'), then these values will be applied to all galleries. However, if any settings have been changed at page level (on individual gallery pages), then these values will override theme level settings and you will need to change the page level settings back to change the corresponding galleries.

If you want Showkase to add a custom link at the end of your menu on every page each time the 'Publish' button is clicked, you would need to to open the 'showkase/admin/classes/nav.php' file in a plain text editor, scroll down to line 177 and just before the return $navDom; line, construct the HTML you require within a <li> tag using PHP DOM techniques and append your custom DOM element(s) to the $navRoot variable.
For example, if you wanted to insert a link which displays the text 'Click Here' and directs the user's browser to the URL http://www.example.com/index.html, then you could use the following code:

$customLi = $navDom->createElement('li');
$customA = $navDom->createElement('a');
$customA->setAttribute('href', 'http://www.example.com/index.html');
$customText = $navDom->createTextNode('Click Here');
$customA->appendChild($customText);            
$customLi->appendChild($customA);
$navRoot->appendChild($customLi);

Please note that the source code of Showkase was not intended to be modified by users in such a manner and I do not know what (if any) knock-on effects this may have.
More information on using the PHP DomDocument class can be found here.
I hope this helps.

Please see the Managing Multiple Sites support section and this forum post entitled "Multiple-language versions of the same site" which should hopefully point you in the right direction.