I've freshly installed Mountain Lion. For first few days, the start and shut down went fast. But recently, the shut down takes really long time, it keeps showing the white and grey loading symbol before it finally shut down. This might happend after one day, when I was browsing through Chrome, I mistakenly touched some short-key, and Chrome begins to "Converting" something, and the computer became really slow, seems like died. So I shut down my air directly by pressing the power button. After that, the shut down time became very long. I don't know if this is really causing by chrome. Does anyone have the same problem? How can I fix this?