Have you inadvertantly turned off the "Vectorial Hatching" in the "On Screen Display Options"?
This will affect how the hatching appears on screen but not the printed output.
Barry.
One of the forum moderators.
Versions 6.5 to 27
i7-10700 @ 2.9Ghz, 32GB ram, GeForce RTX 2060 (6GB), Windows 10
Lenovo Thinkpad - i7-1270P 2.20 GHz, 32GB RAM, Nvidia T550, Windows 11