After using iTunes my Mac doesn't shut down!

My MacBookPro doesn't shut down after using iTunes. I have try anything and the apple support can't also help me.
I can only stop my Mac with the power button. If I don't use iTunes I have no problems to shut down the Mac.
Have anybody a similar problem and can help me? Thanks

It's so curious...
I found something at: https://discussions.apple.com/message/17590111#17590111
I'm not sure whether this issue caused by Library/Preferences/com.apple.alf.plist.

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