Dup Equiv K / Sys Pipe Node

When opening HydraCAD, you get this error

Unhandled Exception...DAO32Server...

HydraCALC is calculating the equivalent lengths wrong 

This error is unique to version 24.2.001.   When restarting a calcultion that previously failed, after picking the Continue button the program (Revit) totally freezes!!!!

Hydraulic Calculations runs, the Calc Process finishes, but no nodes are placed and a HydraCALC file isn’t created.

Can also hang as step 2.3, depending on program version. 

Trying to open Listable Dynamic Blocks and you get this error message

The problem is, you already have a newer version. 

Go to HydraLIST, click [Help|About HydraLIST] to confirm.

When trying to insert a Sprinkler Head Schedule (SHS command), after viewing the setup dialog box, then selecting sprinkler heads, when asked to select a location for the guide, you get the error;

Please pick start point for schedule

Error: bad argument value: non-negative: -1

Error placing Reference Points or Demand Area annotation.: System NullReferenceException: Object reference not set to an instance of an object. nodes reference finish

Calc process gets stuck on step 5a.3

Calc stops at step 2.2a, also creates Run-time error 5