I do not know how long this has been going on, but I just noticed it.
There are extensive drop down menus on my website built with the Foundation Top Bar. The initial Splash page defaults to an About page:
On the desktop, on Chrome, on Firefox, the drop down menus work.
On Safari, they do not.
Of note, the only menu item that actually does work from the About page is Video. That is the only top item that has not been made invisible by the <header code, which would appear to be the source of the problem.
Interestingly, if I go directly to another page, for instance: http://pomelopress.com/info/faq/, the drop down menus work on all three browsers.