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

Calc loading bar stops completely at step 1a.9

When adding a device the below error appears.

Primary calc results are shown, and when selecting OK to continue back to the calc input screen, the two messages below are displayed, twice;

"The designated source node was not found in the list of pipes" OK

"Calculation failed for an unknown reason" OK

Process Error Hydcalc

When trying to change pipe types, the selection window is blank 

Command failure for external command ... System.IO.FileNotFoundException ... File name 'AWSSDK'

Runtime Error 7 Out of memory run-time error 7 run time error 7 Runtime Error 7 Miscfunc

When opening HydraCALC, you get this error.

Startup error

An error has occured during startup. The decimal separator & digit grouping symbols are not set correctly in Control Panel! The digit grouping symbol must be a comma!

Command is run, but nothing appears to happen. May get Nil message

Double-Clicking on a riser nipple, or using the Edit Riser Nipple command (ERN) briefly displays the edit riser nipple dialog, which then closes