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?