After a clean install of Yosemite, multi-touch gestures have stopped working on two occasions on my Macbook Pro 2011. Each time, the symptoms are the same:
Gestures stopped working both built-in trackpad and bluetooth trackpad.
BetterTouchTool still works. Restarting, stopping BTT doesn't help.
Hey, at least two-finger click -> right click still works.
I've tried the following:
Toggling trackpad configurations doesn't bring back the gestures.
Disconnecting, reconnecting, removing bluetooth trackpad from list of bluetooth devices doesn't work.
Restarting solves the problem. However, a restart in my case is a time-consuming process. It involves properly shutting down apps, dismounting network storage, disconnecting VPN, etc - only to revert all the steps again on startup.
I suspect the process interpreting multi-touch crashed when the malfunction happened. CPU was quite busy at both point. So I wonder if there is a process I can call up when it happens again, to avoid restarting the machine.