ZBrushCentral

Any way to change Flat Render's background colour?

ZBrush Usage Questions
#1

For some reason, Flat Render changes my document’s background colour to a medium grey, regardless of what I set the background to in the document settings. I do not want this - instead I want the background to be black. Any way to change this?

#2

Huh?? Do you have ZB4R6 P2?