Maybe it has something to do with the way they were saved - but I am not sure what that could be.
The GS demo files have 5 shading options - all available.
I notice in models I have created that 'Realistic' and 'Black & White' are greyed out.
A 6th one appears - 'Stored in model' and that is active by default.
I don't have time to investigate it right now - does anyone else have the answer?
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