Mouse / Trackpad preferences reset at every restart.
I have a Macbook Pro running Yosemite. Starting about a month ago, every time I reboot my mac, two preferences reset to their defaults.
1. The scroll direction resets to natural scroll for both the trackpad and any attached USB mouse.
2. The mouse tracking speed resets to the default (very slow) setting for the trackpad and any attached USB mouse.
Resetting NVRAM does not resolve the issue. I've also tried looking for any mouse-related plist files under ./Library/Preferences/ ... no luck.
Any other fixes to try are appreciated.
Thanks.
MacBook Pro with Retina display, OS X Yosemite (10.10.3)