When trying to get into HydraCAD, you get this error message.

Your HCAD_ENV.INI file is corrupted.
This is found in the \HES\HYDRACADWER50\PROGRAMS\VersionXx
folder where XX is the version you are using. Please copy this file from
a working machine and reopen HydraCAD or contact Hydratec for
assistance
 

Opening a drawing is taking a long time.  The process is very slow.

Unable to Load HCADWIN.MNL

ARX does not load. HydraCAD functions do not work

AutoCAD Options Files tab contains greyed out entries. No entries in the Files tab can be edited, added or deleted

Command Line in AutoCAD is missing

bad argument type: numberp: nil

error: consp nil

Size of PDF is coming out very large.  For instance, a 2MB drawing generates a 13MB .PDF file.

Drawing Setup dialog doesn't load

No error but when the HydraCAD template is selected, it goes straight to the drawing and command prompt, it doesn't ask for the user to set the scale factor

When Opening HydraCAD or trying to list a drawing, you recieve any Error containing the following CLSID:

44D62FAE-67A7-4131-BF38-489CDFE44738

Or any of the following HRESULT error numbers:

0x800736B1

0x80040154

0x80070002

0x80080005

0x80029C4A TYPE_E_CANTLOADLIBRARY