Legacy v.19 Issue: No Isometric Behavior with Isometric Crosshair Option

I have not yet experienced this issue until yesterday: A simpler, 2D ISOMETRIC piping drawing's crosshair shows ONLY as in an ORTHOGONAL orientation even the default SNAP STYLE shows as ISOMETRIC.

I reset the SNAP settings but with no success, audited, refreshed the screen, etc., to no avail,

Do you have any thoughts?

NOTE: Opening the file in the latest AutoCAD version shows the correct ISOMETRIC snap style.