1. Inserting a hydraulic reference point doesn't erase an existing ref point at the same location

2. New ref points in HydraCALC are not using the values of the HYD ref points.

When I use Pretty Sprinklers, all the nodes that were attached to my sprinklers when using All Ref Points disappeared. 
When trying to get them back by re-running All Ref Points, they don't reappear.

AutoCALC is creating extra node points where there shouldn't be.  In the image below, node 45 shouldn't be created as there's neither a flowing head nor a change in diameter at that point.

'extra node'

'extra ref point'

'extra reference point'

'refpt'

When I use Pretty Sprinklers, all the nodes that were attached to my sprinklers when using All Ref Points disappeared. 
When trying to get them back by re-running All Ref Points, they don't reappear.

Error placing Reference Points or Demand Area annotation... The 3D view ownerDBViewId is not locked.

Step 1a.1 - Error box - missing Pipe Type pointing to Ref 1 & Ref 2

can also be Step 1a.4

Dummy reference points cannot find the dummy ref point block in the drawing's block table. **Possible there's a missing registry entry** Dialog box 52.04

Step 1a.10 - "Attaching Node 2 Elevations" User ID Duplicated Dwg ID Dup for User ID

Duplicated hydraulic ref points

Bad ref point block Dialog box

When trying to open HydraCAD after a recent install, you get this error or one similar to it;

"Missing shortcut", Windows is searching for acad.exe.  To locate the file yourself, click Browse.

AND

Problem with Shortcut - The item 'acad.exe' that this shortcut refers to has been changed or moved, so this shortcut will no longer work properly.

Nearest match based on size, date, and type:

Do you want to fix this shortcut to point to this target or do you just want to delete it?

When trying to add reference points, none are added and this error shows:

When trying to add reference points, none are added and this error shows:

Untitled.hlf is somehow protected and will not delete. Runtime Error 70, 70

Some application unistalled or delete miscrosfot jet files form the computer. Most if not all of the files listed below are missing from either the windows/system32 folder or the program file/common/miscrosoft shared/dao folder DAO350.dll ExpSrv.dll MSJet35.dll MSJInt35.dll MSJtEr35.dll MSRepl35.dll MSRD2x35.dll MSVCRT40.dll VB5DB.dll VBAJet32.dll Runtime error 3633, 3633

Pipe fittings in certain views were grayed out and could not be selected, making it impossible to edit or work with them.

Error occurs when using some commands.

Autodesk has just released AutoCAD 2026.1.2 - and it breaks HydraCAD. It includes a major programming change by Autodesk that will require a lot of work and a large update by us. That update is being worked on right now, along with a version of HydraCAD for AutoCAD 2027. Both are now affected by essentially the same programming change.

BinaryFormatter serialization and deserialization are disabled within this application. See  https://aka.ms/binaryformatter for more information.

Other commands with this error;

Sprinkler Layout dialog (SL command)

Upon starting the Show 3D command (S3D) the drawing immediately switches to SE isometric, reports no errors but no 3D piping is visible.  Even newly drawn pipe won't elevate.

Drawing successfully elevated to 3D. No errors were found

Related HydraCARD: #853

https://hydracards.hydratecinc.com/cards/card-853

Step 1a.1 - Error Box - User ID Duplicated

Transfer to HydraCalc - Step I1a.10 System is now 'Attaching Node 2 Elevations error occurs, please report both the step number and the step description to support! Error Display Error Type User ID Duplicated Step Ref 1 Ref 2 Ref 3 I Ref 4 1a.1

When viewing a plot, hydraulic reference points in the HYD2 layer have thick text.  Editing lineweights for the layer does not make a difference.

Double-clicking your HydraCALC icon makes nothing happen.  You do not see HydraCALC open onscreen nor on your taskbar.  HydraCALC does not open other than in the task manager.

If you open your task manager and see the app "Hyd_prog.exe" open but not on your taskbar, then the application is stuck in purgatory.

Another possibility may be that it's on the taskbar but not on your screen.  That means it's open but offscreen. 

See this HydraCARD to fix that issue;  HydraCARD 565 only AFTER you've checked on the solution below.