I need help with something thats driving me absolutely crazy. I don't know why but mac made the command + or - aka zoom shortcut work on the desktop. Whenever I'm working in photoshop and I use the command when I'm not actually clicked in the app it messes with my icons making them bigger and smaller and changing the custom arrangement I have set up. Any mac experts out there know how to disable the desktop command shortcut so it doesn't conflict with photoshop. You don't know how many times I've accidently zoomed my desktop icons super big and had to re organize after the slip up.