Menu stopped working on mobile devices when WordPress 4.4 updated

I have 2 sites that use the Pinboard theme. One is paintedfurnituremilwaukee.com

I have gotten calls from both customers recently that the menu’s don’t work on smart phones. I have verified this on my iPhone. The Menu appears, but the drop-downs don’t function at all. The only change that has happened on these sights was the recent upgrade of WordPress to 4.4.

Please help me figure out how to fix this. We really like the versatility of the Pinboard Theme.

Mark