Hi,
I have updated the packages so that it works now. Also, you don't need to bind anything manually, simply having the NGuiEventsToPlaymakerFsmEvents on the same gameobject as the slider will do as long as you implemented the NGUI / ON SLIDER CHANGE event or your custom one for that slot.
I have created an example for this ( tutorial 10 -sliders in the playmaker ngui samples).
Bye,
Jean