I searched and found nothing like what I am experiencing.
When I finish a Tube Route, a part is created in the Assembly Tree, and I can edit it, remove it, etc, I just can't actually SEE it.
See attached picture for what I mean. Could this be a graphics card issue? My coworker can open the same model and see the tubes just fine. His computer is actually 3 years older than mine and has a different graphics card, though I'm not sure what it is.