I've seen discussions about this in LR 3 but not in LR 4 and I'm wondering whether my problems with the Clone/Heal tool in LR 4.3 are unique to me.
I'm on a 2.3 GHz Intel Core i7 Mac Mini with 16GB of RAM, running OS 10.8.2 and LR 4.3.
When this tool works, I love it. And it often does work. But about a third of the times I go to use it, and especially when I'm zoomed in to 1:1, the little target icon freezes at the margin of the photo and will not move. Or it will dart from place to place as I move my mouse around. Or I can get it into place to click on an offending speck, but it won't show the preview of what the healed spot is going to look like. In short, LR acts like I'm asking it to do something massively computational, and it gets very balky. But I do far more intensive things (panorama stitching in CS5, etc.) and my computer never protests. I don't think it's my computer's fault, in short. I think there's something broken about this tool.
Am I alone with this? And is there anything to be done about it?
Thanks for your thoughts.