Draw Slope Direction Pattern - InRoads SS2\SS3\SS4

Hi All,

Does anyone have any experience using the "Feature Style Pairs" option in the Draw Slope Direction Pattern tool in InRoads SS2, SS3 or SS4?

When I attempt it I get the error "No features displayed for surface 'SURFACENAME'", even though the features are displayed.

I've tried 2D, 3D. I've InRoads SS2/SS3/SS4. I've tried creating surfaces using various methods, I've tried altering the feature styles and using different feature styles.
In all cases I get the same error.

However, I have seen another user get this to work successfully on some occasions.

Ticking "Interactive" and applying the pattern manually works fine. However, I am after an automated way of doing this if possible.

If anyone has any ideas on how to get this to work, it would be greatly appreciated.

Thanks

Liam