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

There is also Runtime error 5 invalid procedure call or argument 

HydraKEY icon disappears from the desktop when trying to run the application after install. 

When trying to export to Navis, you get this error message;

TWO SYMPTOMS:

Drawing fittings and pipe look disjointed, like that time an alien team of scientists were performing out-of-phase medical experiments on the Voyager crew.

Or, on the way into Revit, you get this error;

Error (must be addressed in order to continue)

Revit has experienced an unexpected error.  The operation has been cancelled to protect your project from corruption

Deleted element

When reporting the error, you may see this;

Hashtable head_table, Hashtable FLXpipeTable, List '1 listFtgs, flexpipes PipeTypeInfo ptInfo

When double-clicking a .WXF file, you get the error, "An error has occurred and HydraCALC cannot be loaded;

Path:  

File: 

Printing a stock list displays printout which looks like very small print.  Trying to change the printer by using the SETUP button makes no difference.

Couplings get closer than expected to outlets when cutting in. 

During a HydraCALC re-install, you are presented with this error message.  After clicking OK, you have to finish the incomplete install process 

Error: -1605  This action is only valid for products that are currently installed

Selecting any of the three choices below will  result in the same error.

When trying to open HydraCALC, you get Run-time error 9 - Subscript out of range

Drawing looks strange, piping looks hollow and sprinkler heads a little off and Acad background looks greyish/grayish.

Drawing also seems to lag when panning, processes take longer

HydraVIEW - Component 'VSPRINT7.OCX' or one of its dependencies not correctly registered: a file is missing or invalid

Error message AutoList.exe has stopped working at this point in the AutoList process.  

While raising to 3D, AutoCAD just crashes.  No error, no warning. 

In the status bar, it was working on Computer Generated riser nipples

No error, fittings and pipes have gaps in Medium and Coarse detail levels. 

Command Failure for External Command... ...System.IO.DirectoryNotFoundException

No error, but when pressing the toolbox button the file explorer opens up. 

Command Failure for External Command... System.NullReferenceException: Object reference not set
to an instance of an object

When running an AutoLIST, you get the error;

AutoCAD Error Aborting

INTERNAL ERROR: eNotOpenForWrite message

Command Failure for External Command... ....System.Exception: No routing preference set for...

Layer Notification Warning

Unreconciled new layers exist in the drawing

Unhandled exception.  eAtMaxReaders