Using a Wacom Cintiq with stylus for most inputs. In the color panel, sliders flicker and resist precise control, as if pen and mouse inputs conflict. Please advise if a setting is needed to prioritize stylus input.

In the public beta, the lastest build as of yesterday April 25 was not working correctly in the Color Mode. But in the regular shipping one, it was all fine, including on my Wacom tablet.

So I’d agree with PeruBob about checing for driver or firmware updates.

Check for a Wacom driver update.