If you move the dialog to a new location from its original position, you loose the ability to select control points. Closing the Mask Tool and re-opening it, then open the Hue & Saturation dialog without relocating will restore control point select-ability.
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Mask - Hue & Saturation Dialog -- v8.0.139
Moderator: jsachs
Re: Mask - Hue & Saturation Dialog -- v8.0.139
Fixed for next release.
Jonathan Sachs
Digital Light & Color
Digital Light & Color