The Preview window are not refreshing correctly
I got a movie clip of 6 Mb to show, But I can not upload it to forum
I will try and explain
Start WM
Enter Advanced perlin and change the Feature Scale close Advanced perlin
Click on Terrace and se if it looks right
Enter Advanced select perlin set in Layout, select the X and movie it. Exit back to Device view
No click on Advanced perlin and then click on Terrace. They do not look the same.