I bought my Magic Mouse yesterday at the local Apple Store. I did everything according to the instructions:
- Download and install the WirelessMouseSoftware update for Snow Leopard. Check.
- Pair the Bluetooth mouse with my Mac Pro. Check.
- Go to the Mouse System Preference to see the new options. Check… wait a minute…
What?! No gesture options showed up!
After some quick online problem research, I saw that USB Overdrive — a utility I’ve used in the past — could be the source of a conflict. I ran the downloaded and ran USB Uninstaller. It reported that USB Overdrive was not currently installed, therefore, there was nothing to un-install.
Re-downloaded the software, restarted, retried. Still, no gesture options.
After much frustration and much trial and error, I came upon the solution. Although the USB Overdrive uninstaller didn’t detect it, there was indeed a file called USBOverdrive.kext in System/Library/Extensions. I tossed it out — restarted — and bingo! Magic Mouse gestures now available!