I found another glitch with the PWR THD vs Freq routine. When I change the power level and re-run the routine, I get the error seen on the screen copy below. If you hit OK, the run is added to the graph and it looks fine, and you can continue running at another power level if you wanted, but will get the error as soon as you add it to the same graph again. I was going from 5w to 1w in this case:
