Starting off with the easy to do fix.
There are two .plists in your user Library/Preferences.
com.apple.driver.AppleBluetoothMultitouch.mouse.plist
com.apple.driver.AppleBluetoothMultitouch.trackpad.plist
Hold down the option key while using the Finder “Go To Folder” command. Enter ~/Library/Preferences. Move the .plists to your desktop.
Restart and test. If it works okay, delete the plists from the desktop.
If the same, return the .plists to where you got them from, overwriting the newer ones.
If you prefer to make your user library permanently visible, use the Terminal command found below.
http://osxdaily.com/2011/07/04/show-library-directory-in-mac-os-x-lion/
You might want to bookmark the command. I had to use it again after I installed 10.8.4. I have also been informed that if you drag the user library to Finder it will remain visible.
Send Apple feedback. They won't answer, but at least will know there is a problem. If enough people send feedback, it may get the problem solved sooner.
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