Eye Dropper malfunctioning in Aperture 3.5/Mavericks.
After upgrading to Mavericks and Aperture 3.5, the eye dropper tool, when clicking on a photo with a gray card, turns the photo a sickly green color.
Aperture 3, OS X Mavericks (10.9)
What is your white balance set to when you do this? Some here have noted issue when it's set to "temperature/tint" but if it's on neutral grey when you pick, it works OK.
