Just got a Canon 5DSR. Prior to updating the firmware from 1.1.2 to 1.1.3, the 2 second preview after taking a picture worked. However, since updating the firmware the preview is so dark you can barely see that there is an image. Also, pressing the Preview button to review pictures on the card does the same thing. The preview is so dark you can barely tell that there is indeed a picture there. How do I fix this?