Revolution slider not working after installation of Hummingbird


I've been installing WPMUDEV plugins on some of my sites. I'm still in my trial period but I'm loving the way it all comes together and will definitely move to extending my trial to a subscription.

I have one problem to date and that is a Revolution slider in the header of

It seems the plugin can't find the right jQuery library. I'm getting: Uncaught ReferenceError: jQuery is not defined
(anonymous) @

in the console. This happened after running Hummingbird.

I realise that I'm running a very old version of the Avada Theme here and that may be the problem. Avada is a bit of a problem to update particularly if you are jumping a major update, but if I have to, I will.

I'll try disabling plugins etc but just wondered if you had experience of this and could point me in the right direction.

Many thanks,

Phil Nicholl

p.s. I've just deactivated Hummingbird and that solved it but I would like to know why it was happening. Feel free to reactivate Hummingbird to test as the slider is not a critical element and traffic is (for the moment) pretty low :slight_smile: Thanks again.