When I click on the menu bar icon or do the two finger swipe from right to left (starting off trackpad) the Notification Center should open and did until a few weeks ago. I have tried everything I can think of from the basics like rebooting and repairing permissions to things like resetting the pram (not sure if that could have anything to do with it, but I am desperate at this point). This is on my MBP. Thanks in advance for any suggestions.