"Hydraulic Engine not responding" and then an "Error 62 input past end of file" usually happens on 2nd area run through

Unhandled Exception: Index was outside the bounds of the array

x Zero length pipes found in system model YES will cancel... No will allow...

Area # section is blank or missing remote areas in the AutoCalc Setup dialog box. Area number is not recognized

The specified remote node does not have a k-factor. Please fix your input. On Pass 1 Calculation Failed for an unknown reason.

Trying to insert a fabricated pipe via HydraLIST doesn't show any outlets, ski poles, etc.

As shown in HydraLIST;

Inserted into HydraCAD;

Note, no GOL is shown.

When selecting Valve Selector in the 3D Fittings window, you get the error message;

SOURCE: System.Private.CoreLib

MESSAGE: An item with the same key has already been added. Key:

When trying to insert a valve type fitting from the parts tree, you get the error; 

Still!!! Block ### is missing.  Please insert manually.

However checking the database for the drawing file shows it exists.

When trying to insert a specific fitting, you get the error

Could not add this part to the fitting because of missing endprep

then;

AutoCAD Error Aborting

INTERNAL ERROR: !dbentapi.cpp@719: eNullObjectld

While in your viewport, your riser is visible while in the 2D Wireframe view.  However if you change the Visual Style to Conceptual or Shades of Grey/Shades of Gray, your 3D riser disappears.  You may notice if re-appears if you zoom out.