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BPR filters material shading issue

ZBrush Usage Questions ZBrush 2021 Usage Questions
#1

Hi,
BPR filters material shading is not working for me.
I followed this excellent vid from MLW Creative:

but no Matcap material I put in the image filter texture map is having any effect on my best (not preview) BPR rendering. Filter is activated, Material shading slider at 100, opacity at 100 and blend mode on “Replace”. Modifiers all “ON”.

I tried on 4 different versions of Zbrush and result is the same on each version.
I’m surely missing something, thank you for any help…

#2

Push “Reset filter” button first each filters, then you follow the vid.
In my case, it works.