I'm getting PHP warnings when I run the plugin:
PHP Warning: Parameter 1 to ace_where() expected to be a reference, value given in /Users/simon/Projects/InternetRetailing/site/wp-includes/plugin.php on line 220
If the plugin author is reading, here are the changes I made to fix the problem: http://wordpress.pastebin.com/i40dmGfq
Essentially drop the
& from the parameters of the
ace_join and (deprecated)
ace_list_categories functions and it's sorted.
Hope this helps.