The trackpad gesture to call Mission Control or Expose with three-fingers does sometimes not work for some reasons. It works when I use four-fingers, and it functions as usual whenever I open my System Preferences and reset the Mission Control and Expose section to use three-fingers gesture (instead of four-fingers). However, it's set to three-fingers at first, and it's just that I first disable it and then enable it again...
The symptom occurs whenever I restart my Mac, so it's nothing but tedious to bother to open my System Preferences to check off and then on to the Mission Control and Expose checkboxes. As I said, when I reset the setting, it works as usual.
My trackpad is Apple's Bluetooth trackpad, and my Mac Pro is late-2013 machine. I also use mid-2012 MacBook Pro with Retina display, and while it might occur on the machine at times (maybe only a couple of times per 1,000 sessions), I have not had such issues almost usually.
Is there anything that I should investigate further? PRAM and SMC didn't resolve the issue... I'm curious to know why it occurs whenever I restart my Mac, and how to solve the issue.
I use the latest version of Mavericks.