When selecting "Retrieve Part Num/Desc <" from the sprinkler Block Definition window, you get the error;

Error: bad argument type: stringp nil

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 trying to open a drawing file, you get this error; 

DAO Server - Error DBOpen4

Call from 'hcad_fignames'.

Path:'C:\HES\HydraCAD\Ver50\AutoListElements\Data\Setup\MdbTRANS.mdb'

DAO Error:  Unrecognized database format

C:\HES\HydraCAD\Ver50\AutoListElements\Data\Setup\mdbtrans.mdb'

When you click OK, AutoCAD crashes out

When re-opening a calc file generated by Hcad for Revit, you get a Runtime-error 62, Input past end of file

Followed by an 'error during load_data' message.

NOTE:  After clicking OK, the job will open to blank data.  Close the file.

DO NOT CLICK 'YES' TO SAVE YOUR DATA otherwise you will lose all your data and there is no way to recover it.

When plotting to Bluebeam document, some HydraCAD drawing entities show up blacked out.

AutoCAD view;

PDF generated by Bluebeam;

When printing final, your outside hose demand after the pump isn't included in the total flow.

In the example above, the system demand is 1274 gpm is represented by point D2/D3.  The outside hose adds up to another 250 gpm but there isn't another marker at 1524 gpm

*Please note, while the Demand summary at the top shows D3 as a point, since D2 and D3 are the same value, the graph will only show point D2.

When trying to run the calculation, you get the message, 

"The system flow demand of ### exceeds the maximum rated flow as indicated in the Pump Curve for the pump with the inlet of PI and outlet of PO.  The calculation will not continue"

But your flow is a very large number

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

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.

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.

When running a Darcy-Weisbach calculation, after changing your k-factor, the program will not ask to Modify K-Factor anymore

The calculation method you have chosen is only a legal calculation method under NFPA 13 rules for anti-freeze systems and requires modified k-factors

Have the k-factors already been modified

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 = ### 

All layers where objects should appear white in AutoCAD will randomly turn brown in color (colors 18, 19, 248, or 249)

Note the pipe dimension and main piping in the image above are brown instead of white.

Turn off Wipeout frames was selected, but the drawing still has wipeouts

When inserting a listing tag on a pipe, you get the error, "Invalid color number"

When clicking the Calculate button or the OK button from the Pre-Calc Questions window, you get a Runtime-error 5,

Run-time error '5': Invalid procedure call or argument

When attempting to insert a cap, it draws the pipe and dimensions it, but it doesn't insert a cap.

However if you draw a test pipe elsewhere, it successfully inserts the cap for you

When running the "FSC Setup" to "Create FSC Definition". 
Upon finishing the block definition, the block definition is missing a crucial property for "Hydraulic equivalent length is referenced by:". This field will show blank or the default generic text and did not include the HydraCALC pipe/fitting reference information.

There is a missing HydraCALC "ImportExport" directory.

Default line text:
`Hydraulic equivalent length is referenced by: shortname with length number - longname Listing: FM`

After attempting to download the Latest Toolbox, a warning appears saying the file cannot be opened. 
Tells user to delete toolbox .rvt file and try again, but that does not work.