Hello all, First time posting here, have lurked for a while. I'm having an issue with my 2013 MBA with the notification center (The pop out thing is that, correct?). Up until recently It has worked fine as I have used the pop-out thingy for stocks. However a few weeks back it suddenly stopped popping out but instead I can just highlight the little button beside spotlight, and It highlights blue when I click it but nothing happens, it doesn't pop out. I have researched a bit on the web and tried a couple things in terminal to resolve this but nothing has worked. I'm not sure what the problem is and/or how to resolve it. I'm considering upgrading to the next OSX as I am on 10.10.1 Yosemite if that will solve it but I would like to know the root of the issue if it is a common problem. That said, as my computer is almost three years old, is there anything I should be doing to maintain the health of the machine into the long term to ensure I maximize my investment in this product? I recall the saleslady saying that macs had a similar thing to a Windows disk defragmenter that could be used to clean up inefficiencies. If so, what is this and should I be doing it? Are there any other things I should be doing? I don't turbo boost very often. Thanks in advance for any help you can offer me.