The latest version of iOS (the operating system for iPads and iPhones) has changed the way Safari handles clicks, which has subsequently changed the way the menu system works in Vanity. The problem is that Instead of showing the submenu, it goes directly to the underlying link instead of showing the submenu.
To fix this some code needs to be added. Here are the steps:
- Open theme.liquid in Shopify Admin > Themes > Template Editor
- Scroll to the very bottom and find the line that reads "$(".ellipsis").ellipsis(true);". It is line 153 on the latest version of the theme.
- Insert the code listed here immediately after that line: https://gist.github.com/3969734