Thank you for the quick reply!
I did try a the above methods and it is still not working. I do want to mention that I changed the domain as we went live on WPEngine hosting.
I don't know if that would have any effect. Since the staging url http://www.liveintent.staging.wpengine.com remained the same (and the search still works)..I assume it is an issue with the domain possibly changing file paths somewhere along the way.
Any other ideas before I can send over admin creds? This is a production site so it is a bit concerning to be editing and testing lots of things while on the live site.
Below is some more error logs:
[Tue Feb 10 21:12:03 2015] [error] [client 220.127.116.11] PHP Fatal error: require_once() [function.require]: Failed opening required '/nas/wp/www/cluster-2209/liveintent/wp-content/plugins/ajax-search-pro//includes/imagecache.class.php' (include_path='.:/usr/share/php:/usr/share/pear') in /nas/wp/www/cluster-2209/liveintent/wp-content/plugins/ajax-search-pro/search.php on line 11, referer: http://liveintent.com/
I went to line 11 in search.php to find the below line…
Looks like the error is being thrown because it cannot find the imagecache.class.php file?