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I have a logitech wireless mouse hooked up to a macbook pro running 10.7. Whenever I middle-click the mouse button, the laptop's display brightness decreases. It behaves just as if I had pressed the F1 key. The middle-click still works in applications (e.g. Firefox opens a new tab), it just has this annoying side-effect. How can I correct this behavior?

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Does it dim temporarily or only while you have the button down? Does the onscreen display brightness indicator display when this happens? –  ephsmith Jun 28 '12 at 23:11
The indicator appears and the brightness stays decreased until I press F2. If I middle-click enough the display goes completely dark. –  sciurus Jun 30 '12 at 2:49
Okay. It sounds like you're middle click has been mapped to that key somehow. Did you install logitech's software for controlling what those buttons do? –  ephsmith Jun 30 '12 at 3:40
No, I didn't realize there was such software. I'll check it out. –  sciurus Jun 30 '12 at 20:58

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