Screen moves BEHIND cursor only with magic mouse

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Nov 18, 2016
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I have a 2009 Mac Pro and when I am doing anything with the magic mouse, quite often the item that I want to click on or highlight will move around behind the cursor. The cursor doesn't move, but the screen behind it will jump around enough that I end up clicking on the wrong thing. This only happens with the magic mouse. If I use the wired mouse everything is rock solid.
The magic keyboard works just fine. If I'm scrolling down a list as an example, and I want to click on the third item, the list behind the cursor will move about and I have as much chance of selecting item number two or four as three. Batteries are fresh and I don't have any connection problems.
Any ideas where to start?
 

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