Uncaught TypeError: Only on Drupal edit pages I'm using the BigSlide.js sliding menu on my drupal site, which i've built into the theme,  and it works fine on every page, apart from on /edit/ pages. E.g. user/%/edit.
When clicking the target menu button nothing happens - the menu should slide out from the left. 

In the chrome console i'm getting: 


  Uncaught TypeError: undefined is not a function




As you can see from the image above it's referencing bigSlide.js, I've tried updating jQuery to 1.9 with the Jquery update module as i'm using 1.7 and that didn't help, and i've made sure all my JS files are being loaded on /edit/ pages. 

What could be the problem?

Here's the issue spot within bigSlide.js



Any help much appreciated.
I had installed the dev version of jQuery Update 7.x-2.3+15-dev, which allows you to specify different versions of jQuery for normal and administrative pages: 



I'd done this because I had previously required jQuery 1.5 for something in the backend. It appears /edit/ pages are considered 'administrative' pages - (which seems odd to me)  and therefor were using 1.5 which broke the bigSlide.js menu. 
Changing the admin pages back to 1.7 fixed the issue.