I just switched computers and installed Photoshop/Bridge CC and Camera Raw 8.4.1 on Windows 8.1. In Camera Raw, the preview check box has disappeared, and I don't see a way of toggling quickly between full before and after views, just split screen options. Also, the heal/clone tool doesn't work. It fails to cover anything even when set at 100% opacity. My laptop still has Camera Raw 8.3, which still has the preview check box and the clone/heal tool works.