--snip--
Even if so, I'm not sure how you can conclude that it's platform based. That seems a pretty low likelihood conclusion.
Mac handles graphics differently, i.e. if I use any tile-gfx (Jaredonian's characters, other modded items) with Alpha-layer enabled, the background/green-screen won't be invisible, but shows as green*. I have a
hunch, not knowledge, it's possibly related.
If the alpha is off on vanilla graphics, so it'll display correct on Mac, it might be needed on covering other layer (snowy cave floor) on W10.
If the graphics have Alpha disabled on Mac and enabled on W10 package, then I'll agree that the issue is likely something else.
* other members, had come across the issue earlier for others.