Waterloo, Ontario, Canada, North America, Northern Hemisphere, Earth, Milkey Way...etc.
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That happened to me too...but only when I'm on a laptop. It seems that if the game doesn't find a mouse when it starts, one can't zoom in or out.
You can fix this by plugging in the mouse's USB, or just the USB stick of a wireless mouse, before you start the game. So long as it's recognized, it should fix this...