When attempting to run the HydraKEY install, the install fails to run with Error 1500.  Two instances of the install appear in the task manager.  Neither completes succesfully.  Killing one of them closes them both.

After processing a stock list, the Total weight value displays as -999.0000

Unhandled Exception... System.ArgumentOutOfRangeException: Index was out of range

When trying to open HydraKEY, you see the spash screen, but it eventually times out and the application does not open

Auto Adjust Fittings defaults to unchecked.

Error encountered when creating an FSC block... Can appear as either of the two shown below:

When trying to open HydraCAD after a recent install, you get this error or one similar to it;

"Missing shortcut", Windows is searching for acad.exe.  To locate the file yourself, click Browse.

AND

Problem with Shortcut - The item 'acad.exe' that this shortcut refers to has been changed or moved, so this shortcut will no longer work properly.

Nearest match based on size, date, and type:

Do you want to fix this shortcut to point to this target or do you just want to delete it?

When opening HydraCAD and trying to open a drawing or a template, you get the error message; 

Also happened when layers were isolated trying to burst objects

'unrecognized version and cannot be read'

When opening HydraCAD, you get this error message or something similar

AutoCAD Warning

The following shortcuts in the search were invalid and ignored: \Users\AppData\Local\Microsoft\Windows\WinX\Group...

After clicking OK, HydraCAD will open up, albeit very slowly, and almost every step will take an significant amount of time, for example 45 seconds to start a new drawing or to size a pipe

AutoCAD Settings may preclude use of object snaps within hatch patterns.