When connecting a hard pipe armover to a flexible sprinkler connection (FSC), the flex hose doesn't continue straight, instead it immediately turns 90° before curving back and down to the sprinkler head.

Even with setting the connection to OVER-DOWN

When selecting a vertical pipe/riser nipple hydrapipe, the PROPERTIES window shows "no selection" instead of "hydrapipe"

You may notice that you cannot use the 'change length' command (CL) or cannot rotate riser nipple (RRT)

Revit could not complete the external command... Object Reference not set to an instance of an object.

Initialization Failed... Could not find part of the path

Spacing and Layout... Unhandled Exception... Method not found: HeadSelectorForm

No error but the calculation process takes a very long time and is slow.

The process hangs and usually the RAM runs up to 100%.  You'll likely hear the computer's fan rev up.

No error but the AutoCALC process takes a very long time and is slow.

No error, just hangs while using 100% RAM.  Usually around step 2.3

Running HydraCAD commands do not work in one drawing, but will work in a different drawing in the same session of AutoCAD/HydraCAD.

Inserting a pipe dimesion gives an 'unknown command' message.

When opening a specific cac file you get this error

Other calc files open fine

Hydrapipe - vertical pipe issue Switching to Edit Mode leaves HydraPipes in Hydrapipe layer. Then when trying to show system model you get an AutoCAD message box "Please Switch to Edit Mode. Then try again." Switch to Edit....