Does it work if you turn off GPU acceleration?
Lightroom >> Preferences >> Performance (tab)
Thanks for the advice.
I will try later and inform you.
Now I am on a mobile phone and I'm not at my computer.
I always work with a pen.
With the pen curve is not working in Lightroom CC.
I tried to turn off GPU acceleration but unfortunately not working.
Also, when you turn off GPU acceleration Lightroom works very slowly.
Most likely there is an bug in Lightroomu in conjunction with Wacom tablet Intous pro.
I dont know what to do.
When I adjust curves I adjust them with the mouse and so HLS with point on the photo with draging up-down (does not work with tablet and pen).