For some reason when I use the spot healing tool and click on the "background copy" it just blinks green and does nothing. In addition, when I use my clone stamp tool the brush starts out white, I select the place I want it to copy and then click and it does NOTHING. I feel like it is a setting or something easy but I can't figure it out. My mode is: normal. the opacity is 100% and my layer is 100% opacity and fill is 100%.