Xbox 360 Controller not recognized by Macbook.

I just bought an xbox 360 controller to play games with it while programing it through a software. When I first plug it in, the Mac recognizes the controller. If I unplug it and then plug it in again, the 360 controller lights will flash, but it won;t recognize it. If I restart my computer, plug it in, its fine again. Now, if I plug it in, it works, un plug it, but plug it into a different usb port, it will work again. Once I've used one port, it won't work with it and will have to restart my Mac. Any help would be great, Thanks!