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After downloading all the source files, searching for WT_ and finding no results it occurred to me this might be a browser issue.

Looking at the error it was coming from kiwitrees.js, and I think my browser had cached that file. Forcing a full refresh (SHIFT+F5) it has pulled through the latest JS file and the page is loading again.

Thank you both for your comments here.

My personal kiwitrees installation - http://familytree.derekjwhitten.id.au