Sometimes when I go to close a window in OS X, it seems that the buttons don't work. The "X" on the red button will come up and the same goes for the yellow and the green. I click over and over again but I can't close the window. This goes for any window in OS X, not just Finder. To get around this, I have to sometimes click on something else and then come back to it. Am I just doing something wrong or is there something up with my computer? Thank you.