ANSWERS: 1
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This is normal. It takes the receiver some time to properly decode the compressed video signal received from the satellite or digital cable system. You need to wait until the receiver receives at least one key frame in the signal. This delay is unavoidable and an inherent part of the video compression scheme used during transmission. Video compression algorithms achieve part of their compression by transmitting only the video data that changes between each frame. Substantially less video data changes between frames than is required to display one complete frame. Since you cannot form a complete video image from only the change data, every so often a complete or 'key' frame is transmitted. Once the key frame has been transmitted, the algorithm returns to transmitting only the changes in the video signal for a period of time. When you change to a new channel, the receiver cannot know what a complete video frame contains until it receives the key frame. The receiver shows a blank screen and mutes the audio until the video can be displayed properly.
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