Hi, my iTunes worked fine on my 2013 Macbook Air for about 18 months. Since the fall of 2014, I can't drag and drop anything. If I click and hold, nothing happens. Everything else works fine and this has been happening across all version of iTunes since. I can't figure how to reinstall since it is linked to OSX (correct?). This is a major annoyance for making playlists and adding songs to my phone. My trackpad works fine dragging and dropping files and I have tried using a mouse. I have also rebooted my system since then obviously. Any help would be greatly appreciated!