After several days try to figure out why Mac OS X Mavericks screenshot doesn’t work anymore. Is it not working or just it’s the location replaced to another folder? Tried with keyboard shortcut Control + Command + Shift + 4 or Control + Command + Shift + 3, but still not working even I heard sound like camera clicks, tried to find the file but there’s no file. I tried everything but still not any result. I gave up.
But there is still the last waty how to take screenshot on Mac. Open Preview app and go to menu File >> Take Screen Shot.