Another thing that I had to do with my car is when I use the stalk to signal, I either have to kind of "push" the stalk forward while signalling up or down, or "pull" towards me.
Also check your relay's, you should atleast hear them click.
Mine look very similar to these, except the casing was more of a goldish/bronze/brown color.
One should be under the dash, above the hood latch cable puller, another one on the passenger side under the dash.
If not, replace those, if still no click, check fuses and the trace wires from the signal stalk.
Try signing up on HybridZ.org if you haven't already and search and see if someone has had the same problem.