Do this require a specific version of the Leap Motion software? I'm currently running v2.1.5+22699 on OS X 10.10, and using your example patch just outputs a black jit.pwindow. The jit.fpsgui objects are updating with correct information about the output, but I'm just not getting any visuals. Unplugging the Leap results in a "Leapmotion is not connected" message in the Max window, so it's finding the Leap at least.
I use Mac so this is great, but a Windows version would be great for a project I'm working on. Are there technical reasons why this can't be ported to PC or does it just need someone with the relevant knowhow to take a look?