Hi, my MacBook Pro recently started to more or less hang on the shutdown process. I will shutdown the laptop, and it'll hang at the bluescreen with the gray thing spinning. I left it alone thinking it was just a quark, but after an hour, it was still there. I had to hold down the power button to get it to shutdown. I posted this on the Apple Support forum, but it devolved into an argument over the idea of fixing the permission is necessary and what not. Please, help a noob out.