I thought I was starting to get the hang of Pipe Routing, but then it does something unexplained which I can't figure out how it happened (to avoid it) nor how to restore to how it was.

Ref. 2016 SP 3.o, Routing package, 316SS SCH.40 buttweld specification.

Maybe I mis-clicked something or such, but these items are not actually transparent in a way that I can toggle transparency off. The material is 316SS (not acrylic or other transparent material). This only applies to the pipes and elbows, which are the items generated by the route. The solid looking elbow and pipe in the middle-left of the image is from a separate route which relieves into this suction train, which I was recently finished editing when I noticed this lower route had gone transparent. It was fine last month, as well as 10 minutes ago.

Failed remedy attempts:

* Click component, toggle transparency.

* Change material (and change back).

* Edit route(s), rebuild, close route(s), rebuild.

* Save, close, reopen.

(less important) How did I do this?

(more important) How can I fix this?

Further impact.. this has no affect on the drawing of this part, which still appears as opaque pipe.

For now, I'll leave it unsolved because it doesn't affect end result of today's work. I hope to learn how to avoid this. Thank you.