Since Mac OS X Lion (I'm using Mac OS 10.8.2 now) I have the exact same issue with audio midi setup software from Apple. It's not really a not working thing but it still is annoying: Every time I open audio midi setup to change something (e.g. change to my Apple TV for audio playback) and close the window afterwards the application doesn't quit – what would be OK if a click on the Icon (or the starting of the application over Spotlight) would cause the application to open a new window of audio midi setup, but it doesn't. So what I have to do to get the window back is first quitting the application manually and restarting it again. That's quite painful since I sometimes opened the application days ago and forgot that it's still opened... Does anyone have the same issue? Can someone explain this behavior to me? And most important: Does anyone know a workaround?