I've had this problem for a long time, and finally decided to try to fix it again. My AirPort icon in the MenuBar seems to have disappeared, but just the image. Where it should be is just a blank space, almost as if it's transparent. It still functions just as it should, but never shows the image. I've replaced the .menuextra with one from my other computer to try to fix it. The seemed to start when I was finding white icons for my black menubar. Here are some pictures to show what I'm talking about. Any ideas?