This is an old problem i'm desperately trying to find an answer for. I have an old mac that I just upgraded to OS X Lion 10.7.5. I've got Photoshop CS5 and I can't save a psd file. Even when starting a new file. I get an "access privileges" error. see pic below. It only affects photoshop. Illustrator and Indesign work fine. Does anyone know or remember a fix for it?