Thread:Project:Support desk/Auto suggest not working

I've installed several Wikis and never had a problem with Auto Suggest in the search box. It's not working on my current wiki. I've tried suggestions found elsewhere using the different variables to no avail:

$wgUseAjax; $wgEnableMWSuggest; $wgVectorUseSimpleSearch;

This stuff always works; what could be different about this wiki?

MediaWiki	1.19.13 PHP	5.2.17 (cgi-fcgi) MySQL	5.1.73-cll URL: https://neucart.com/wiki/Main_Page