Cross Section/Elevation Tool Glitch - Only Shows Front View of Garage

[Doug_Morrison]

I am having a persistent issue using the Cross Section/Elevation tool in Home Designer Pro

When attempting to create a cross-section on the second floor of my story-and-a-half house (specifically to measure knee wall heights), the tool fails to cut where I draw the line.

No matter where I draw the cross-section line on the overhead 2D floor plan (along any axis/direction), the resulting 3D view is always an orthographic exterior elevation that is a cut through the forward-facing garage on the first floor. It will not generate an interior cross-section view of the walls or roof framing as intended.