I cannot get the dropdown list of fonts to show inside the theme customizer.

I have searched the forum and read the documentation under "Enabling Style Customization" including "Advanced Customization with Type, Spacing & Images".

I can get all other style (color) customizations to work: background color, topbar background color, topbar text color, button color, button hover color, etc.

However, the font-family dropdown selector fails to work.

I am using Zurb Foundation 6 for my grid framework.

I have tried getting the font-family customization to work in both my original, fairly simple design. I also tried using a very basic stripped-down theme with no content, no css and no custom js.

Any ideas what I am missing?

Thanks.