Bad brush preview when layer unselected and bad render

[ZeWalker]

Hello everybody, Im currently facing this problem in AS11.2 pro x64 on windows 10 (the width of brush is changing i guess)

I have no clue of why it append, may someone can help or guide me to solve this problem ?
Thanks.

[synthsin75]

You can disable GPU acceleration in the preferences if the change of unselected layers is too distracting, but this does not effect renders (and your video didn't show that it did). GPU acceleration improves workspace performance by displaying unselected layers as images instead of constantly calculating the vectors.

[ZeWalker]

So i just solved the problem, disabling gpu did solve it only in preview as u stated and not in render. But my issue was coming from the Script Sketchy effet