Hi Greg,
not sure if my issue is related to your topic but I have problem using the command “select line type”.
I made 2D of my 3D model, and I set line type in the “hidden” layers to line type “hidden”. As I tried to select only the hidden lines by command “select line type”, rhino included the “continuous” lines but left out the “center” lines.
attached is my file.
drawing.3dm (1.8 MB)