I was working on an image and the radial filter circle has disappeared. I quit LR and reinitiated it. Nada. I want to keep working with the filter but it is no where to be found. It occasionally lights up very faintly but it is definitely not the clear circle with the handles. I would be most grateful for an answer to this puzzling dilema.
Found the answer...it is merely to hit the H key to make it appear or disappear. Logical...but maddening nonetheless.