Just installed Mavericks. It seems to be functioning correctly with one big exception. Tapping on the Trackpad doesn't work. Clicking works but that isn't easy and is tiring. I've had to use two hands on the trackpad in some instances such as highlighting a sentence or inserting the cursor. Using one hand to try to insert the cursor causes it to skitter off into anywhere but where I want it. Sometimes it takes several clicks before it works.
Another example, it takes two hands to 'Grab' as trying to click, grab and drag is virtually impossible with one finger.
Trackpad in System Preferences shows 'Clicking and Tapping' but only clicking is effective.
Suggestions gratefully accepted as my hands are getting tired from the extra effort.