I've installed Hummingbird on my website and if Wishlist Member and/or WP Masquerade is active, it is giving JQuery errors that stop Hummingbird working. There also seems to be a conflict with WP-SEO but when WLM and WP Masquerade are disabled, the problem disappears. Here are the errors I'm seeing in the console of Chrome.
Uncaught TypeError: Cannot read property 'length' of undefined at wp-seo-admin-global-450.min.js?ver=4.5:1
Uncaught TypeError: Cannot read property 'length' of undefined chosen.jquery.js:829
chosen.jquery.js:829 has the following url: