When running a calculation, the results window pops up but just stalls or hangs there.  

The window will eventually say (Not Responding) and you can't click out of it

After adding a Secondary Curve to your water supply, you decide you don't want it, it's impossible to remove the secondary curve value.

When trying to [Print|Final] in HydraCALC, the user gets a Runtime Error 5, "Invalid Procedure Call or Argument".  HydraVIEW does not open and after clicking OK, HydraCALC crashes.

When editing and saving data for pipes, fittings, or flexible connections, you get a Run-time error 76, Path not found error

Bad location of K-Factor

Trying to run a calculation, you get the error;

Could not Initiate Process called for by: (name of the problem file), ie. HydCalc.exe or Miscfunc.exe

Reviewing the results you notice a discrepancy between the k-factor of an equivalent k versus a sprinkler head using that equivalent k-factor

In the example below, EQ02 has a k-factor of 5.37.  Reference point 1 is supposed to use the k-factor of EQ02 (5.37) but in fact is using a different value (5.36).

When double-clicking a .WXF file, you get the error, "An error has occurred and HydraCALC cannot be loaded;

Path:  

File: 

During a HydraCALC re-install, you are presented with this error message.  After clicking OK, you have to finish the incomplete install process 

Error: -1605  This action is only valid for products that are currently installed

Selecting any of the three choices below will  result in the same error.

When trying to open HydraCALC, you get Run-time error 9 - Subscript out of range