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Revit Based File (Ribbon/Toolbar/Location)
No error, but my 90-degree elbows aren't showing up in coarse detail view.
You are using an older version of the 90-degree elbow fitting (most likely Hcad2-Flck-90) and need to upgrade.
Go to the toolbox, and under the Fittings section import the Hcad3-Flck-90 and select Override on the bottom of the window. Then, choose continue.
Go back to the project and select the 90-degree elbow where the lines aren't appearing, select all similar instances in the view/project, and change them over to the Hcad3-Flck-90.