Apple has issued an update for selected 2013 and later model iMacs that fixes a graphics issue that caused the machines to freeze after viewing large JPEG files in either Finder or Preview under OS X 10.10.3. The problem specifically affects the late-2013 21.5-inch and 27-inch iMacs, as well as the late 2014 27-inch 5K Retina iMac. The problem could, in some circumstances, trigger kernel panics or force a restart.
