No palm rejection

[Jokinb]

I have IPAD3 and wacom intuos creative stylus 2.
Artrage version 1.6.5. The lastest.
I can't get the palm rejection feature work sucesfully.
In setting the multitask gestures are dissabled.
I connect the WICS2 sucesfully.
I press the stylus's buttom and a window appears saying that the palm rejection is ON.
But there is not palm rejection. If a put my hand in the screen it is detected. It is imposible to draw with tha palm touching the screen.

What is missing? What I 'm doing wrong?

Jokinb