I am trying to use my T3i in M mode and also use live mode. I don't seem to get an image on the LCD screen unless I press the shutter button 1/2. As soon as I take the picture the LCD screen goes back to all black with a white rectangle outline in the center of the screen. I will be using the camera in an underwater housing and seeing the live view before I am ready to snap the shutter will be important to me.