I've recently upgraded to Yosemite from Mavericks on my new Mac Mini. I routinely use Screen Shots to "Copy picture of selected area to the clipboard" to paste into Adobe Illustrator to use as a template. Since upgrading, I get the message "QuickTime and a decompressor are needed to see this picture." I am able to save the screen shot to the desktop and drag it into Illustrator, but it is another step that I'd rather not have to do. I have QuickTime installed.