Unable to select a pipe or fitting when trying to use the Delete Pipe tool.

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

Step 1a.3 - Fitting Exchange No replacement fitting name for 22E for Sched-10 Note: This could be any fitting or pipe type described in the error. If you click ok at each error, the process will run through without these fittings

When trying to break in a rapid pipe/rapid line/rapid main, it will not tee into a pipe.  In the image below, it is not showing the break in triangle.

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?

Missing names or values of Sprinkler or Pipe properties in the Properties menu, as shown below.

When trying to size a pipe, the units show up as millimetres/millimeters (mm) instead of inches or the values for half show up as a backslash

HydraLIST process freezes at Processing Cover Page Report - Optimizing pipe

Or freezes at processing pipe sketches

Or at optimization

When processing a stock list, the SldReports window reports, "could not find part number for the given pipe type"

Move the window to reveal the Processing Reports window where you'll see which section ID it's having problems with

Clicking OK will report others with similar issues, the process will not complete.

When inserting a vertical pipe/riser nipple with a fraction in the diameter you get atypical results

The fonts for fraction symbols ¼ (quarter), ½ (half), or ¾ (three-quarters) are replaced with ?.840, ?1.050, and ?1.660

When printing a final calculation, the font doesn't show fraction symbols for ¼ (quarter), ½ (half), or ¾ (three-quarters)

They're replaced with ?.840, ?1.050, and ?1.660

These should look like this;

Of note, if using HydraCAD for AutoCAD, you get similar results on riser nipples/vertical pipes 

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

When starting AutoCALC, it stops in the v50 Fuel Gauge at step 1a.4 - Calculating Total Lengths. 

Working on the pipe from node #### to node #### with a fitting string of ...

May be followed by a Runtime Error 13 or Runtime Error 5

Your first step of troubleshooting should be to track down the coordinates of the handles (the 4 to 6 character hex code noted after the word node, or pipe, or fitting.  Search for the command FINDME to get these coordinates.

When starting AutoCALC the v50 Fuel Gauge stops at step 1a.4 plus you get a Run-time error 6; Overflow 

Working on pipe from Node ### to Node ### with a fitting of "?" and a diameter of / pipe type of 0.5 / SCHED-40 where the pipe id = ### 

The "####" values represent handles.  It is recommended you use the FINDME tool to find the coordinates of the handles, this will help narrow down the cause of the error.

May also see a Runtime Error 5, "invalid procedure"

When attempting to insert a pipe dimension you get the error "Invalid option keyword"

And the command prompt says "Enter an UNDO control option" with the dialog showing your choices

When starting the Pretty Pipes command, you get an Unhandled Exception error including 'Could not find a part of the path'

Another error may mention blockoffsets.dat

When attempting to create a 3D model, you get the error; Please switch to System Model to Annotate Drops and Sprigs plus

System.NullReferenceException: Object reference not set to an instance of an object

at HCADexports.RevitConversion.create_hydrapipes_from_db()

at HCADexports.RevitConversion.create_hydrafittings_from_db(List'1 pipes, List'1 heads)

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

The font of your vertical pipes do not match the font of your pipe dimensions

Calc process gets stuck on step 5a.3b