YOur video is in 16:9 format. When you go to full screen it gets 4:3. Something is wrong in here. When returning to windowed mode, the video window gets to 16:9 again but your desktop get affected by the change.
Is there somwhere you have enabled an option to go to a screen resolution or a custom aspect ratio when entering full screen mode ?
Does pressing NumPad 5 key help in any way ?
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