Have the same problem, Wwise is not doing the same as the tutorial on the page shows ... In fact I oppened the Cube Wwise Proyect, and explored the Gem Drop objects, and the Path List in there is not changing either. It allways play the first Path of the list.
This changes if you change the "Play Mode" from "Continous" (wich the tutorial especifically explain that should be selected) to "Step". But that goes against what the tutorial is teaching.
Tried to find more documentation on those settings and couldn't find answers there.