I just updated a couple days ago, and the clone stamp tool is not working right. I reset all preferences and it literally worked for one cloning.. then it went back to the little dot of a preview which is useless. I tried restting just the tool, and now there's not even a dot... no preview at all regardless of how big of a brush I ma using. This makes cloning impossible. New bug? Or is there some work around I'm missing? On a 5K imac.