Corel Painter X3 crashes with Mac OS Sierra 10.12

I’ve recently updated the OS on my iMac to Sierra. The version is 10.12

Annoyingly it seems there’s an issue with Corel Painter X3 running against this OS. Admittedly there’s only one scenario I’ve found where the application crashes, but it’s still pretty maddening.

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There doesn’t appear to be any rhyme or reason why the brush sizer should remain static even when I’ve selected it and continued to draw. But occasionally this happens. If I then try to resize the current brush again, the application quits.

I’d certainly welcome a fix to this but my guess is that Corel are motoring forward with newer versions of Painter.

I’d also welcome any ideas for a workaround should the sizing bar remain in place.