After buiding your 3D risers, raising to 3D, exporting to a Persistent Model and Navisworks successfully, your 3D riser is missing, with the exception of the skipoles

Your layers are on and the 3D_DETAIL layer is present, unlocked, thawed and visible, you just can't see the pipe and fittings.  The one customer reporting this said they disappear if the drawing is closed then re-opened.  They'll be visible in viewports as well, just not in 2D view.

See this related HydraCARD also;  https://hydracards.hydratecinc.com/cards/card-1144

Missing commands on Add in for HydraCAD when trying to generate a RevitLink conversion

This error may start out as "Could not load default information for the Pipe Model settings"

But will then turn into an AutoCAD fatal error.

When selecting the Navis Toolkit then the SETUP button, you get the error;

AutoCAD Error Aborting

Fatal Error: Unhandled Access Violation 

1. Import clash errors does not work. Display Units any

When opening a 3D persistent model drawing, user gets the error and Acad crashes INTERNAL ERROR Dialog box v53.04 + v54.01

Retrieve HydratecRevitContent is missing from the AddIns - Hydratec pulldown menu in Revit

1. Loading Revit content into a non-MEP template (ie Construction or Architectural template) Revit

1. Our Addin file is looking in the wrong location for our Revit tools Revit

1. mismatched files HCADexports.dll and HcadAquaFlex_50_1.arx Unhandled Exception Make Revit Content HCAD Revit 4.0.0.3

Sprinkler heads were not properly defined with a part number within the HydraCAD drawing. Therefore, Revit used a default sprinkler head symbol which happened to be a pendent sprinkler symbol. Revit