The instrument pip value calculation is wrong in the source of the zigzag indicator (JForex-API-2.7.9-sources.jar\com\dukascopy\indicators\ZigZagIndicator.java):
double instrPips = Instrument.EURUSD.getPipValue();
This possibly makes this indicator not accurate on other currency pairs. I haven`t tested it, just saw this in the source and thought, I will report it.