Newbie here....I restore and color old photos. the past few days my paint brush ( round light brush ) that I have used forever suddenly is like a spray brush or air brush with a little blue circle and my brush expands and then goes the blue circle..I have checked all my setting for the brush.......I never changed anything as to how it would change to this, I never mess with it,,, It is really messing up my precise coloring in an area. What could I have possibly done.I have tried restarting, Thank you Carole