Mighty Mouse button doesn't work in Login screen.

When I boot up my Mac I can move the cursor with the mouse in the Login screen, but I can't click on anything - the buttons don't work. Once I'm logged in the mouse works normally in every way.
This only happens with the Mighty Mouse - 3rd party mice work fine in the Login screen.
I can't see any settings in the Mouse System Prefs that would affect this.
Anybody got a suggestion?

Nobody got any insights?

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Mighty Mouse button doesn't work in Login screen.

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