I have the same problem.
Activation of the plugin : entire WEB Site KO (admin and front)
Fatal error: Call to a member function get() on a non-object in /home/web/NL-5848/green-worm/www/wp-includes/query.php on line 27
WP version : 3.3.1
Plugin version : 1.7.1
Theme : Grido from themify (https://themify.me/themes/grido)
Plugins used :
Advanced Custom Fields
All in One SEO Pack
Dynamic Widgets
Fast Secure Contact Form
P3 (Plugin Performance Profiler)
SI CAPTCHA Anti-Spam
Social Media Tabs
Social Media Widget
Taxonomy List Shortcode
Ultimate CMS
WordPress File Monitor Plus
WP Security Scan
