Hello MacRumor Forums I just download Mountain Lion yesterday, and installed it today, and I was satisfied at the upgrade. But there was one problem; about Notification Center. Normally, if you do a two finger swipe to the left (according to System Prefrences), The Notification Center should pop up. But for me, it isn't working. I tried deselecting and selecting the option in System Prefrences, but it does not work. Is there anybody that has this problem, and is there a way to fix this problem? Thanks.