I have NO IDEA what is going on, but for no reason at all, I can not take a screen shot. I use screen shots ALL OF THE TIME. I do graphic and web design and constantly send clients screen shots to them. I use them for my own personal use as well as business. All of a sudden, for no reason that I can tell.. Screen shots will not work. Command+shift+3 and Command+shift+4 will NOT work, however the other keyboard shortcuts are working just fine.. I have checked the keyboard settings and the screenshot shortcuts ARE enabled. Any thoughts or ideas as to what can be happening here?