Hello, first time forum user and new to Mac (one year). I have Lightroom installed on my Imac G5, 1.83ghz, 17in. When importing pictures, purple pixels show up in some highlight areas. This is not happening in camera, the RAW files and JPEGs look fine. In fact they can be viewed with any OS picture viewer and no purple pixels. Not until Lightroom gets ahold of them do they appear. Could this be display settings or is my Imac just too old for Lightroom? This is happening on windows, people's faces, etc. Please advise. Thanks in advance.