Sorry for the inconvenience. Chance of typos in templates, the navigation header should be functional for most versions of the handbook.
Potential remains for unforeseen breakage primarily in the handbook portion of the wiki.
Notice will be up until above verified and no other troubles found from recent modifications.
The concept for this template was to provide more obvious feedback when the navigation header template info was not entered properly. It may take a bit more thinking on my part to discover a way to do what I am seeking, and possibly a significant change to NavHeader would give me the result I want, without another template.