Hatch patterns on floor

[sagnewYUXLR]

Hi there, 
I was just wondering if anyone knows why when i set my hidden line detail to all in a structural view discipline i get a green hatch for concrete etc. 

the view on left has hidden line by discipline and one on the right is set to all. even by changing all the colours i stlll get this green coloured hatching. 

thanks 

[hmunsell]

is that a cut pattern in a material applied to the element or is it a filled region placed in the section?