When selecting Valve Selector in the 3D Fittings window, you get the error message;

SOURCE: System.Private.CoreLib

MESSAGE: An item with the same key has already been added. Key:

Runtime Error 3167. Error message: Record has been deleted

Using the Sprinkler Spacing and Layout tool: Revit encountered a Autodesk.Revit.Exceptions.InvalidObjectException: The referenced object is not valid, possibly because it has been deleted from the database, or it's creation was undone.

Calculation stops at Step 1a.4 - calcing total lengths

Can be accompanied with a "Runtime error 5 - invalid procedure call or argument" or "Runtime error 6 - overflow"

When opening HydraCalc v50, you get Run-time error '13' Type mismatch OK

The calc program MAY open but you cannot open any jobs or do anything in the window.

Setting certain pipe diameters with specific pipe types gives an ID of 0.

Eg. 1½" - SCHED 40 shows up as 0 rather than 1.61. n/a HydraCalc

Run-time error 9: Subscript out of range 

Area 21 of 30

When viewing your Persistent Model drawing, you see the clamshells/Pacman/bracket for the riser nipples/vertial pipes

Using HydraCAD buttons cause errors like Loading Shared Parameters for Pipes Failed....

During the AutoCALC process, it gets hung up at step 5a.3b. 

Re-Ordering Pipe Paths - Phase 2