Brush Size - control/option in Mac not functioning
Up until a couple of days ago I was able to change the size and hardness of my brush tool using the control/option keys on my Mac. Suddenly it stopped working. Now when I press control/option I get a colour pop-up. I can still control the size of the brush with my bracket keys. This problem may be associated with learning to use layer masks because the problem began around the same time I started working with them. Perhaps I inadvertently clicked something but I'm stumped. Everything else seems to work fine but I'd really like that function back. Any help would be greatly appreciated.

