[Hustle] Unable to Create Anything in Hustle

I've recently installed Hustle and am trying to create a new Slide-in, however when I click "Create" it brings me to an unresponsive "New Slide-In" page. I can't enter anything into the Content section, and nothing happens when I try to click on the 'Design' or 'Display Settings' on the left-hand side menu. I get the same issue for all the other types of modules as well, completely non-responsive. I've tried this in Firefox, Chrome and IE and got the same result.

Furthermore, the Dashboard menu structure for Hustle Pro does not match what is shown in the documentation. I don't see any sub-menu for "Email Opt-In", is the documentation for Hustle out-of-date? Support access has been granted.