Hi, I just filed a ticket at Poser Support.
Today I installed the latest version of Poser on my computer and went to work with it.
I'm working on some shaders for a clothing item, but to my surprise, the preview windows of all shaders are black.
It's like I switched all light sources off.
I know from experience that it takes some time to load up the previews, but even after I rendered the scene, with all the correct textures at place, those preview windows are still not showing anything.

I hope that get's fixed quickly, because thats not the way I like to work. Its a bit like stumbling around in the dark.

Greetings from Germany.

BB