With best of greetings I am afraid that I have made something with 3DGS (honestly said, it is A6), that actually shows a model changing its skin... but one of the persons who are in need of it only gets shown a totally black model instead.
What, I wonder, what might be this mystery's mysterious root?

(Of course the grapgic card 's to blame, but the question rather is, whether I might be able to solve it with some changes within the code.)