Hamburger animation doesn’t work in latest version?

Hi,

I’ve got this plugin installed on two local sites – one is a slightly older version and the other a fresh download today.

The hamburger animates to a cross when clicked on the older version, on the new one it doesn’t. Not sure if I’m going crazy here but can’t find the setting anywhere! Also compared the admin area of both and the settings are exactly the same!

Does this no longer work with the free version or am I completely missing something?

Thanks!

Pat