Mick, check your settings in movie mode. Your settings i.e Shutter speed and ISO sensitivity may not be set to enable Liveview to give you an image. Give the camera sensor more signal by increasing the ISO or reducing your shutter speed. Your camera settings may be set such that it does not give the sensor enough signal in this mode, that's why you may be getting discrepancies in the view between camera and movie mode. I usually have my movie mode set at around 1600 ISO and 60fps at a native f5 OTA to capture planets like Saturn. Saturn is way past opposition so it won't be very bright. Without knowing your telescope focal length and aperture, it's hard to say what's going on.
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