Is this happening with a specific image or all?
Could you please share a screenshot of that screen?
Also, would suggest you to make sure the program is updated to Lightroom CC2015.5.1: Keeping Lightroom Up-to-Date
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Try unchecking Auto Mask at the bottom of the brush panel.
Thanks for reply.... I have latest LR cc...I have gone back and reset image and tried again, with improvement.
I have noticed the image already had a lot of noise (handheld evening landscape at iso 1000) with purple and green obvious chromatic abberation + ....I think the base image was not good enough to use the brush on it...I think more practice ...but if you have any resources on how to avoid this chromatic abberation in my images... I would be very interested as I seem to repeat this scenario a lot and never sure what to do about it..thanks again
Thanks Chetan, great article ...I have never used the defringe slider but will now !