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I just got a new-to-me Magic Trackpad, but after pairing it and adjusting the settings in System Preferences, I can't get it to do the two-finger scrolling gesture.

So far, I've uninstalled USB Overdrive, and the Microsoft Mouse plugin I installed previously. Even after a restart, the scrolling is still absent.

This is a Mac Mini running 10.6.8.

What's the best way to come at this from a systematic perspective?

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Did you remove the USB Overdrive kernel extension as well? I had the same issue because I hadn't. – Lri Aug 28 '11 at 11:16
Pretty sure, yes. I used the command-line directions from here: superuser.com/questions/318983/…, which were to use this one-liner: /Applications/Utilities/Uninstall\ USB\ Overdrive.app/Contents/Resources/rmusbo – Dennis Wurster Aug 28 '11 at 12:29
As another data point, I did try downloading the Magic Trackpad and Multitouch Update from Apple's support site. The installer reports that I don't need to install it. – Dennis Wurster Aug 28 '11 at 12:42
Then check for MicrosoftMouse.kext and other kernel extensions. Some are listed at usboverdrive.com/USBOverdrive/Support.html – Lri Aug 28 '11 at 13:07
I found MicrosoftMouse.kext and removed it. I also looked at the list on the USB Overdrive support page, but found none of the ones listed. Rebooted, but the Magic Trackpad still fails to scroll. – Dennis Wurster Aug 29 '11 at 2:36
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So based on the comments the issue was solved by deleting /System/Library/Extensions/USBOverdrive.kext. Other extensions listed at the USB Overdrive support page:

KensingtonMouseDriver.kext
LCC.kext
LogitechHIDDevices.kext
LogitechUnifying.kext
LogitechUSBHIDevices.kext
MacallyKMDriver.kext
MicrosoftKeyboard.kext
MicrosoftMouse.kext
SteerMouse.kext

If any of them exists, try running the original uninstallers of the drivers.

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Right. I don't know what the command-line-triggered uninstaller did, but it didn't uninstall the USBOverdrive.kext. Once it was deleted manually (dragged to trash) and I rebooted, all was well. – Dennis Wurster Aug 30 '11 at 0:41
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I'd perform these steps to help isolate the issue:

  • Fresh batteries (especially if you are less than 50%) - just for testing
  • Reboot the mac in safe mode to disable all third party and non-essential Apple kernel extensions
  • Download and apply any combo updater newer than 10.6.5 (and equal to or higher than your current OS)
  • Make a new user account (a long shot - but worth it)
  • Pair the trackpad with another Mac that's running 10.6.5 or later
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