ZBrushCentral

Problem with BPR Shadows, AO and SSS

Ok, here’s the thing.
When i start Zbrush, with the default resolution, everything works fine,
but if i resize the canvas, all the BPR configurations start to doesn’t work properly.

Starting with shadows, the shadows cover the whole model with an darken color, is very weird, looks like a bug, but i know that is not, and must be easy to fix that, but i don’t know how!

Please, someone can explain to me, how to fix those things?

Here’s an exemple, the image is from PSTCHOART, he was facing this same problem.

Anyone?

Omg i need help, i’v been searching all over about answers to my question, but i never find anything helpful.