After clicking the Start AutoCALCs (SAL command) button but BEFORE the AutoCALC Setup window, you get the error; 

Unhandled exception has occurred in a component in your application. If you click Continue, the application will ignore this error and attempt to continue.

The input string '1◆' was not in a correct format.

HydraLIST - Msg #10010

An ERROR5 has occured!  Invalid procedure call or argument error 5

OR

An ERROR76 has occured...  Path not found

The error occured in; Module - RegModule SubRoutine - Set VB Dev

When printing final, you get this error message

"Error during Cover Sheet print, possibly due to missing .DAT file"

When opening AutoCAD, usually after a fresh install, you're greeted with this error message'

InstallPath registry key not found.  HydraCAD must be re-installed using the current profile.  Defaulting to C:

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.

Run-time Error 339

"Component tab32x30.OCX, spr32x25.OCX, spr32x35.OCX (or a different .OCX file) or one of its dependencies not correctly registered"  "A file is missing or invalid"

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

System seems to hang at this step, but eventually shows the error;

Hydraulic Calculation - 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 Calculation failed for an unknown reason

May not be 1a.3 or 2.3, could be anywhere along here.

Calc process gets stuck on step 5a.3b