Nothing happens at all ...

I had a similar problem in Tutorial IV. When I tried to fire on the second aircraft 'manually', the window which was supposed to appear after double-clicking with the attack-cursor on the hostile aircraft did not. Any ideas ?

<t> I am a new Harpoon player who just bought Harpoon 3 ANW.<br/>
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I have reached the 4th scenario in the tutorial, where I am supposed to shoot down an enemy aircraft manually.<br/>
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However, when I select the attack cursor and double-click on the enemy aircraft, the window that was ...