I have Lightroom ver. CC 2015.10 [ 1111918 ] installed on a Mac Book Pro - With this latest release the local adjustments are not responding. The Adjustment Brush will not paint or respond to controls (IE. Exposure, contrast, etc.) and the gradient shows, however, always with the red mask and doesn't show the adjustments in real time - Only after the Gradient has been deselected. Spot Removal is tediously slow and glitchy.
I'm stumped as to what to do about it. Any help would be very much appreciated.
Brush - Maybe stating the obvious! Do you have Flow and Opacity at 100?
(There is a little dark triangle beside "Erase" that will hide the Flow and opacity sliders.)
Any Overlay (sometimes called a mask) is toggled on/off with the 'O' key.
(Shift+O steps through the overlay colours- red, green, white, grey,??)
"slow and glitchy." is another problem some face with Lr going Sloooowwwww!!
Are you changing the sliders in the specific Brush Panel? ( It is possible to scroll down the panels and adjust the Basic Panel sliders which are Global adjustments)