Thanks for your feedback. We have isolated the issue to the Multiple Event Registration plugin, an important add-on for Event Espresso that allows users to register for more than one event/class/workshop at a time. With that in mind, we need to keep that plugin enabled.
We’ve made numerous modifications to the theme, so I imagine that’s the issue, yet we can’t find a fix. Perhaps we don’t need the “pointer above menu” function at all. What exactly does that do? As a test, I commented out that entire function and the “undefined” error indeed goes away. Could you tell me the risks of NOT having that function running within the theme?