Hi, this function seems to have simply stopped working. I tried it on two images and the wheel spins while it "works," but absolutely nothing happens. Any ideas why and/or how to fix? Thanks!
Ask in the proper Photoshop forum. This may depend on your images, could be damaged prefs or any other program specific funkiness. None of that would be fixed by reinstalling something or whatever, which this forum is about...
Is it a huge image on a low spec system perhaps? CAF can make Photoshop really put its thinking cap on.
If it was something like that, then just try it with a tiny selection of course, but I'm guessing the OP has already thought about that.