Pipe sizes and lengths do not return to drawing. Pipe sizes disaprear

Step 3.2.2c - Creating Calc File

Unhandled Exception has occurred in a component... Item has already been added. Key in dictionary. Key being added: '[handle of object]' CodeBase: file: ../HCAD_HUI.DLL

Unhandled exception: object reference not set to an instance of an object

When uninstalling Hydratec for Revit, after believing it to be fully removed - this error still appears on Revit startup. 

When inserting a vertical pipe, the pipe diameter's suffix doesn't match the regular pipe nor the drawing's setting

When you insert your vertical pipe/riser nipple, you see the text "HCAD/D_UNITS" as the diameter's suffix

When clicking the button for the Parts Tree or to Insert via HydraLIST, you get this error

eInvalidContext

Unhandled exception has occurred in a component in your application. If you click Continue, the application will ignore this error and attempt to continue.
elnvalidContext

incorrect setting for the autocad system variable ATTREQ

When attempting to open HydraVIEW, nothing happens.  Go to the Windows START button, scroll down to the letter H, select Hydratec v50 Software, then select HydraVIEW.  It should open to a blank job, but if nothing happens, see below for the possible solution.

You can also manually attempt to navigate to this folder, then double-click HydraVIEW.EXE;

"C:\HES\Common\Ver50\HydraVIEW.EXE"

Also see the 3rd solution in card #887 if you're having a problem printing final from HydraCALC.