Contextual links not showing

Using both my own theme with this as a base theme and using only this theme, contextual links are not showing when regions are hovered over.

I have checked to make sure that the Contextual Links module is enabled and that the code is being output in the right place in source.

I am getting a javascript error, however, on tabs.js, line 11.

TypeError: $ is not a function

As mentioned in http://stackoverflow.com/questions/12343714/typeerror-is-not-a-function-... this might be fixed by changing the $ to jQuery on this line.

When line 11 has the $ replaced by jQuery, another error shows on line 16. I've now replaced the $ on this line too. Now I'm not seeing any javascript errors, but still no contextual links either.