Hello,
I am trying to render out a document with BPR. The render in the document window has great AA, however all my BPR render passes have jaggy edges. The mask layer is the only one which actually has antialiasing. I have set SPix to 7. Is ZBrush not able to render AA in BPR passes?
What size is your document? You may have to render out larger and resize smaller.
I am rendering the exact same size I want my final image to be. I though you shouldn’t have to render 2 times bigger images anymore. I guess I was wrong 
No, that is deliberate. The reason is that if the edges were antialiased they would contain some of the background color (which you may not want). You need to use the mask layer to clip the edges.