I use my mac for web design, however ML makes this quite difficult. For some reason it doesn't seem to be updating images either locally or on my web server. I can upload an edited image to a site I'm working on and after refreshing in Safari it doesn't change (though I can see in the web inspector the new image is indeed on the server). I just tried my friends web server and it has the same issue, so it's something to do with the OS. Happens on chrome and safari. I have to literally hold down cmd + R for and let it spam the hell out of the local server/web server to get new images to show up, clear the cache. Well done Apple, I have NO idea what's the issue here.