This bug has now been fixed in v1.1.0. Please see this Juicebox Blog entry for further details.

Yes.
Include your JavaScript function in your gallery's HTML index page, such as:

<!--START JUICEBOX EMBED-->
<script src="jbcore/juicebox.js"></script>
<script>
    function doSomething() {
        alert("Hello world.");
    }
    new juicebox({
        containerId : 'juicebox-container'
    });
</script>
<div id="juicebox-container"></div>
<!--END JUICEBOX EMBED-->

... and then in your gallery's XML file, an <image> entry might look something like this:

<image imageURL="images/wide.jpeg"
thumbURL="thumbs/wide.jpeg"
linkURL="javascript: doSomething();"
linkTarget="_self">
<title>Welcome to Juicebox!</title>
</image>

Note that the linkTarget must be set to '_self'.

The 'full.html' file will be in a Juicebox gallery generated by jAlbum and the Juicebox skin only if you have integrated the Juicebox-Pro v1.1.0 'jbcore' folder into the skin files. The 'full.html' file was introduced in v1.1.0.

That is correct. The 'full.html' file is not required for Juicebox galleries prior to v1.1.0.

The 'full.html' file is use to better handle the display of the gallery in fullscreen mode.

All files that have changed and all new files (such as 'full.html') need to be copied across to your gallery's existing 'jbcore' folder in order to upgrade the gallery (overwriting existing files) and all files that have not changed do not need to be copied across.

As an instruction, it is much easier to just say "copy the 'jbcore' folder" than to individually list files within the folder (and their relative locations) which must be updated.
The entire Juicebox-Pro 'jbcore' folder is less than 200KB. It would take much less time to simply upload the entire folder than to separately upload individual files within the folder and make sure that they are all uploaded to the correct subfolders.
If you wish to know which files have changed between versions, you can compare the 'jbcore' folders in a single action with a diff program such as Winmerge.

@pebbleplace

It is relatively easy to use a background image by setting the gallery's background opacity, the last parameter in rgba(), to something less than 1 (so that it is visible), such as:
backgroundColor : 'rgba(34,34,34,0.5)'
... and then changing:

<div id="juicebox-container"></div>

... to something like:

<div id="juicebox-container" style="background-image: url('image.jpg');'></div>

Make sure that your background image is in the correct location.

In the Flash Player in SimpleViewer, the font size was a pixel value. In the Mobile Player in SimpleViewer and in Juicebox, the gallery is HTML-based rather than Flash-based and the font size is on a scale from 1 to 7. Please see here for details.
If you set <font size="18"> in SimpleViewer, the Flash Player would display the caption at 18px but the Mobile Player would display the caption as large as possible (as it is a value greater than 7). Because of this difference, the font size attribute is ignored in SimpleViewer's Mobile Player.
The font size is configurable in Juicebox (as, unlike in SimpleViewer, there are not two different ways the value can be interpreted) but being HTML-based, the scale of 1 to 7 is used.
Also, being that Juicebox is HTML-based, you are no longer restricted to using HTML tags that are accepted by Flash so rather than:

<font size="4">Caption Text</font>

... you could enter:

<span style="font-size: 18px;">Caption Text</span>

In order to see what your gallery will look like on a mobile device, go to 'Customize -> General' and set 'Screen Mode' to SMALL. For more information on Screen Modes, please see here. There is also an 'iPhone Simulation' demo gallery on this page.

Thank you for your other suggestions.

There is no preconfigured option to only increase the distance between the thumbnails and the main image.
It may be possible by modifying the 'jbcore/classic/theme.css' file but it may not be easy to determine what would need to be changed in the file. Please see the Juicebox - Theming support page for further details.

The easiest method would be to increase the imagePadding option from its default value of 0 to 15.
If using JuiceboxBuilder-Pro to create your gallery, this option can be found in the 'Customize -> Main Image' section.

This is a known bug which has been addressed and will be fixed in the next version.
Thank you for reporting.

There is no set time-frame for releases and no release date scheduled for the next version (though it should be sooner rather than later).
However, you can be notified of new releases by joining our mailing list and following us on Twitter (@juiceboxgallery).
Please scroll down to the bottom of our home page for details.

Try adding the following line of code to the <head> section of the HTML page into which your gallery is embedded:

<meta name="viewport" content="width=device-width, initial-scale=1">

This is a known bug which has been addressed and should be fixed in the next version.

Absolutely fine here. No problem!

Thank you for providing the additional information and link to your existing galleries.
A couple of global search and replace actions on your gallery XML files should be all that is required to have svBuilder-Pro successfully open them.
Open each XML file in a plain text editor and replace each instance of <name> with <filename> and each instance of </name> with </filename>.
If you have a text editor such as Notepad++, you can open all your XML files at once and a single search and replace action will replace all the tags in all the files in one go.

You will not be able to pinch zoom if the gallery's dimensions are 100% x 100%. The maximum-scale is set to 1 in this scenario.
You could try using JavaScript to determine the size of the user's browser window and then set the gallery's dimensions to those absolute pixel values instead.

The Back Button is available only in Large Screen Mode.
The default value for the screenMode option is AUTO so when the gallery is displayed on an iPhone, Small Screen Mode is used.
You can force the Large Screen Mode to be used on all platforms (which will then display your Back Button) by setting screenMode="LARGE" in your gallery's XML file.
If using JuiceboxBuilder-Pro to create or edit you gallery, this option can be found in the 'Customize -> General' section.
For more information about Screen Modes, please see here.

(The Back Button is marked as a 'Large Screen Mode only.' option on the Juicebox -Config Options page.)