I am unable to edit my photos without this message coming up when I move any slider to the left of zero - "an integer between -150 and 150 is required. Closest value inserted". The only option to press is "OK" but then the message just keeps repeating and repeating. I have Photoshop Elements 11, so downloaded a trial version of Photoshop Elements 12, and I get the same problem. I am working on a Macbook Pro with Maverick.