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MBPro won’t shut down after Lion upgrade – Mac-Forums.com

System Preferences
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I have the opposite problem where I can’t startup sometimes and get a grey screen that lasts until I hit the power button. Still this is good to know.

Make sure you’ve closed all open windows and applications that you may be using. Also, go into System Preferences, General, and remove the check from the box that states: “Restore windows when quitting…” See if that helps.

Also, the first couple of times when shutting Lion down (especially if have open applications or windows) will take longer.

via MBPro won’t shut down after Lion upgrade – Mac-Forums.com.