I have been searching everywhere and can't figure this out. I am using ver 4.4 on my desktop and when I go to place a Brush, Linear Gradient or Radial Gradient mask they do not show nor can I go back and select the "selector dot" (not the correct verbage I am sure). I have tried hitting the "o" key..nothing. I am sure it is some kind of setting issue because when I go into the very same image with my Ipad and can see the highlighted area as well as the "selector dot". I would have thought it was a toggle or a check box, but I can't seem to find it anywhere. Any help would be greatly appreciated.
Thank you for the suggestions...I have done both, I was "drawings" and when I hit the "h" to toggles to Healing Brush, I"m working with the masking tools. I've played with it a bit more, it appears once I have done an action while in the masking tools application, i.e. "cycle overlay" or "drawn" along the photo, the only way I can change a setting of the masking tool is to exist Lightroom and relaunch it, however, I did find that if I pause my sync it seems to address the problem.