"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.

Step 5a.3b - Hangs up reordering Pipe Paths

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.

blue beam loaded on machine (a pdf writer) 3dfittings unhandled exceptio

When clicking the button for the Parts Tree or to Insert via HydraLIST, you get this error

eInvalidContext

Unhandled exception has occurred in a component in your application. If you click Continue, the application will ignore this error and attempt to continue.
elnvalidContext