Hi,
It's the Enhanced Brush Ghost you're seeing.
I don't know of a solution other than to disable it until Corel provides a fix:
Windows - Edit > Preferences > General - uncheck the Enhanced Brush Ghost box
Mac - Painter X > Preferences > General - uncheck the Enhanced Brush Ghost box
We lived without the Enhanced Brush Ghost through many Painter versions so it shouldn't be too much of a problem not using it. Besides, it's a memory hog so when it's disabled, it may speed up your brush strokes a bit.
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