When trying to Import from the latest Toolbox, the toolbox does not load properly causing Revit to hang, and you cannot close the window.

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

When selecting the menu [Help|User Manual], you get the error message;

Fitting Definition Trying to Read PDF's

Error while trying to open Acrobat Reader.

Install Acrobat Reader and try again.

When attempting to open HydraLIST after a fresh install, you get the error;

[[ Error Openning (sic) Data ]]

Microsoft Error 53: File not found

The file ??? was not found where specified

"filenamehere is missing and needs restored before before HydraLIST will open"  🤦

Running calc displays this error:

Please confirm your Remote Point reference point has a k-factor or flow and pressure

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.

Certain cells in the HydraBID summary sheet were displaying #NAME? instead of expected totals.

When trying to use Cleanup Tags, this error appears and nothing else happens (i.e. the tags were not cleaned up)

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

When trying to select Pick Light, this error shows... Sequence contains no elements

When raising to 3D (S3D command), you get a yellow circle with the message "Takeout of fitting does not match takeout expected for a "??????".  Change fitting of fabrication method"

When trying to insert a specific fitting, you get the error

Could not add this part to the fitting because of missing endprep

then;

AutoCAD Error Aborting

INTERNAL ERROR: !dbentapi.cpp@719: eNullObjectld

When Retrieving MEP content an error occurs. This is caused by a bad heads in the HydraCAD for AutoCAD project. 

Command Failure for External Command

When Retrieving MEP content this error occurs... Revit encountered a Attempt to modify the model outside of transaction

Calc process stops at step 1a.4 and Runtime Error 5 displays

When trying to open Add Device, nothing happens and Revit just hangs up / appears frozen.

No error, but after clicking Setup, Revit freezes / stops working, and nothing else is able to be selected.