Sometimes the audio drivers get messed up. So delete it and plug it back in and hey presto your midi fighter is back.
So if your using a mac go to applications / utilities / audio MIDI set up - midi window doesn't always show so if thats the case go to the window menu and click show midi window
delete midi fighter driver - dont worry if you delete the driver it will reinstall when you plug the usb back in.
That fixed mine hope this helps
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