Hi Morne,
Please try the attached version. If this still does not work, would you mind sending me a sample file so I can take a look at the spline being used to better understand the issue?
These styles are also sensitive to Spline material IDs and Vertex types. For example, downpipe brackets only appear on splines with a material ID of 1. There's a little tut about using them here too, which might be handy.
Many thanks,
Paul