{% assign tmp = '' %}
{% assign pageKey = '' %}
{% assign sorting_sorted_categories = page.categories | sort: 'sorting' %}
{% assign alphabetical_sorting_sorted_categories = page.categories | sort: 'title' %}
{% for category in alphabetical_sorting_sorted_categories %}
          {% if tmp == '' %}
          {% assign tmp = category %}
             {% else %}
         {% assign tmp = tmp | append: '_' | append: category | removeUnvantedChars %}
           {% endif %}
           {% assign pageKey = tmp | removeUnvantedChars  %}
    {% endfor %}
<div id="left_col">
    <div id="nav_level1_wrapper" class="level1">
         {{ site.leftNavigation[pageKey] }}
    </div>
</div>

{% assign tmp = '' %}
{% assign pageKey = '' %}
{% for category in page.categories %}
          {% if tmp == '' %}
          {% assign tmp = category %}
             {% else %}
         {% assign tmp = tmp | append: '_' | append: category | removeUnvantedChars %}
           {% endif %}
           {% assign pageKey = tmp | removeUnvantedChars  %}
    {% endfor %}
<div id="left_col">
    <div id="nav_level1_wrapper" class="level1">
         {{ site.leftNavigation[pageKey] }}
    </div>
</div>
Revert "Try another method of sorting left hand nav"
Revert "Try another method of sorting left hand nav"

This reverts commit 6ffdd95046c7ee117bc1f2162efac0831dbab31a.

SSDD, it made the left hand nav disappear completely.
