About a week ago the adjustment just quit working. No matter what I set the brush on it will not work. I can set any of the sliders to an obscured level and nothing. I have move the flow to 50, 80, and even 100% and nothing. I have turned on the mask overlay display and not red areas. I have turned using the GPU on and off but still nothing. Am I missing something?
After two weeks of looking and playing... I am embarrassed to say I have found the setting which shut off the adjustment brush. I forgot about the density slider and it was sitting on zero. Ha!
OK, now I feel better about the time it took me an hour to figure that out.