We have just had the GT PPC plugin installed, but for some reason ever since our related categories are missing. They are properly set up in the admin, and are called by the following in category.html:

<%if related_loop.length~%>
<h3>Related Categories</h3>
<ul>
<%~loop related_loop%>
<li><a href="<%escape_html URL%>"><%Full_Name%></a></li>
<%~endloop%>
</ul>
<%endif%>

Any ideas?

Never mind, this has been fixed.