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 selecting Adjustable Ring Hangers for pipe sizes larger than 8" the detail does not show.

1)This error usually means that the user does not have full access for the folder. Or a lock file already exists and can not be delete. 2) real time virus scan blocking file. 3050

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

can also be Step 1a.4

Error appears when opening Hangers

Failed to load the following families: z_Pipe Elevation Marker

 No inch marks (“) after the pipe diameter or there are but you prefer to remove them

Inserting a pipe dimension (pipex) places it at the end of the pipe, including its center grip or not even on the pipe at all

See solution #3 if the PIPEX is not on the pipe

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 using Rapid Main or Rapid Line, clicking on the pipe causes a Fatal Error

When using Rapid Main or Rapid Line, clicking on the pipe causes a Fatal Error

Cannot get HydraLIST to print out pipe sketches with 1/8" units

Dup Equiv K / Sys Pipe Node

Calc process gets stuck on step 5a.3b

Calc process gets stuck on step 5a.3

No error, but when trying to connect a sprinkler to a pipe, connect head does not let you select a sprinkler

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

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

After buiding your 3D risers, raising to 3D, exporting to a Persistent Model and Navisworks successfully, your 3D riser is missing, with the exception of the skipoles

Your layers are on and the 3D_DETAIL layer is present, unlocked, thawed and visible, you just can't see the pipe and fittings.  The one customer reporting this said they disappear if the drawing is closed then re-opened.  They'll be visible in viewports as well, just not in 2D view.

See this related HydraCARD also;  https://hydracards.hydratecinc.com/cards/card-1144

Primary calc results are shown, and when selecting OK to continue back to the calc input screen, the two messages below are displayed, twice;

"The designated source node was not found in the list of pipes" OK

"Calculation failed for an unknown reason" OK

Process Error Hydcalc