Quote - Does the GC in Postwork Manager work the same as in Poser Pro? That is, does it un-GC textures before applying GC to the final Render? Is there a way to simulate the Poser Pro ability to turn off GC for specific textures?

I thought you'd get an answer to these questions by now...

No, it doesn't. It only GC's the output render.
If you want to anti-GC incoming textures/colours you have to do it in the shaders, the same way as we did in Poser 7.

"If I were a shadow, I know I wouldn't like to be half of what I should be."
Mr Otsuka, the old black tomcat in Kafka on the Shore (Haruki Murakami)