So I started with this code as a template for my map: Simplifying complex features | Esri Leaflet
It was working well with my layer, but then I went and added three lines from this pop-up example, Custom popups | Esri Leaflet, and the dang thing just broke.
Here is my code: http://cryptb.in/a7tnfM (this should work now)
Am I not able to have a mouse over display box and a pop-up at the same time? The strange thing though is that even when I commented out the bindPopup function in my code it still kills my map.