General problems with MIDI in OS X
If you're having problems with MIDI (can't send or recieve) and/or your MIDI interface is greyed out in Audio MIDI Setup, try this:
Go to MacHD>Users>your account>Library>Preferences>By Host and trash 'com.apple.midi.a bunch of numbers and letters.plist'.
Go to MacHD>Users>your account>Library>Preferences and trash 'com.apple.audio.audiomidisetup.plist'.
Empty the trash and restart, then see if everything is working.
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