Using my own copy of the default theme, dark.css and have modified it a bit to the way I want it. Most recent version, Zenphoto version 1.4.0.3 [6817] (Official Build)

Perhaps I'm just tired or just don't understand what the issue is. Looked at the documentation pages, they are are not real clear on what it is exactly needed to insert a Thumb Nav using jCarousel into a page. Also the link from the plugin page in the admin page goes to a dead link on the Zenphoto site.

If I understand the docs, put and the jCarousel will appear where I place it on my image.php page.

Yes, the plugin is activated. Yes it works just fine in the Zenpage theme.

Here is a snip of code from Zenpage...
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First, SHOUTING does not really motivate to help you. Remember your problem is not more important than that of anyone else.

The functions documentation is easily to be found manually on our user guide:
http://www.zenphoto.org/documentation
http://www.zenphoto.org/documentation/plugins/_zp-extensions---jcarousel_thumb_nav.php.html

There is no "printJCarousel" function. So you used the right function. But the function needs to be placed on the image.php page (as you copied it from there and not album.php).

Didn't mean to shout.

Did move code from image.php to image.php. The reference from album.php was my mistake. Actually, the issue was colorbox. The duplicated theme did not transfer as an exact copy in the sense of everything being active. Colorbox was not active so the javascript was failing on error and grinding to halt on the call to colorbox.