The fix given above is not quite correct http://forums.macrumors.com/showthread.php?t=1803815 as the Library/Applications Support/ folder is in most cases hidden.
To find it you click to the GO menu and hold down the Option key and voila a Library folder will appear. Click on that and you will find the Library/Applications Support/ folder which has the NotificationsCenter folder which you can then drag to the desktop.
So the updated fix is:
Here are the instructions I got from AppleCare from an Apple Engineer. I'm not sure if the fix was specifically for my machine or if it'll work for someone else. Follow at your own risk.
1. Open the Library folder in your Home folder (Use Option GO Menu and open Library - otherwise it is hidden).
2. In the now open Library folder, open the Application Support folder.
3. Locate the folder named NotificationCenter. Drag this folder to the desktop.
4. Next, open the Terminal application.
Copy and paste each line of these commands into the Terminal window, in order. Press Return after each line:
cd `getconf DARWIN_USER_DIR`
rm -rf com.apple.notificationcenter
killall usernoted; killall NotificationCenter
5. Close the Terminal app.
6. Restart your computer.
The notification preference changes won't stick until you restart a 2nd time after this.
You can then delete the NotificationCenter folder on the desktop.
