I can't seem to control the color of cables in my routes - everything defaults to orange.

When I edit a route, the cable is light grey.  When I'm done editing the route, it goes to normal grey.

When I rebuild the model, the routes change to orange.  Even when I manually change the appearance of the cable body, it stays orange.

I'm sure there's some logical explanation for what's happening here, but I can't figure it out.  Can someone solve this puzzle?