Curves bug DaVinci Resolve 15.1.2

Hi,
after the last update, via Appstore on my Mac Pro 2013 on OSX High Sierra, I have a serious problem working with curves on the first node. Seem on some clip that the curves tools doesn't affect the video. I doesn't have any changes looking my parade and monitor. On the 15.1.1 version everything was fine.
Any suggestion?
Thank you.
Vlad
after the last update, via Appstore on my Mac Pro 2013 on OSX High Sierra, I have a serious problem working with curves on the first node. Seem on some clip that the curves tools doesn't affect the video. I doesn't have any changes looking my parade and monitor. On the 15.1.1 version everything was fine.
Any suggestion?
Thank you.
Vlad