Noise Mask not working

[Dr.ake]

Guys,

I have been doing this tutorial:

at around 23:26 he starts playing around with noise mask, which does nothing good for me and looks like this:

As you can see with noise mask on the gras is now spawning in palces where the height mask forbids it (blueish areas). The gras is not breaking up like in the tutorial. 

I also played around with the settings a lot, but none of the settings does anything. After the first time, when the gras spawns over the beach, it does not change no matter how I configure the noise map.

What am I doing wrong?

 

[Bryan]

Can you please enable the visualization: 


Its the eye ball icon.