Custom View seems to be the problem.

HydraCAD commands do not work. Ribbon and menus partially missing Check the Support File Search Path. HydraCAD profile was created with no AutoCAD paths during the new installation. Opening

1. InstallPath registry string is not written unknown command Hydrapipe V51/v52

Unhandled exception when using find defline from the smartool options dialog. if there is any pipe that does not get elevated trying this command from the dialog will cause error smartool options

When user moves mouse around, Status bar moves around and displaces Paper Space tabs

While raising to 3D, AutoCAD just crashes.  No error, no warning. 

In the status bar, it was working on Computer Generated riser nipples

When attempting to create a 3D model, you get the error;

AutoCAD Error Aborting

INTERNAL ERROR: !dbobji.cpp@8262: eNotOpenForWrite

While attempting to raise to 3D, you get this error message;

Exception Occured at AddURLToHyperlinks::HydraHeads

The drawing will still raise to 3D but you may not have sprinkler heads visible.

(TYPE_E_CANTLOADLIBRARY)

679327F1-F31E-488D-8FBC-124C4F6F588E

DAO32ServerLib.DaoComObj

When trying to raise to 3D, show model, show system model, you get the error;

Access denied to HydraPipe Utilities

and

System.NullReferenceException: Object reference not set to an instance of an object at HCADexports.RevitConversion.create_hydrapipes_from_db()

When raising to 3D, AutoCAD crashes with no error, no warning, it just closes.

You can test this by closing all open drawings then starting a new drawing using the Hydratec template, "Hydracad Imperial Default".

Draw one pipe 10' long (LN command). 

Place a length & 2" diameter on it (SZP command)

Place a 10' AFF elevation mark on it (AFF command)

Start the process of raising to 3D (S3D command).  It will then crash out without warning around step 2 (something about sprinkler heads).