Upon upgrading to gutsy, I had similar problems - the mouse cursor jumps around at times as though acceleration were set much too high; the scroll on the touch pad no longer works; selecting by tapping on the touchpad (eg. to drag) no longer works. At times there seem to be other strange effects. Definitely not "it just works." I will try the workarounds suggested here.
Upon upgrading to gutsy, I had similar problems - the mouse cursor jumps around at times as though acceleration were set much too high; the scroll on the touch pad no longer works; selecting by tapping on the touchpad (eg. to drag) no longer works. At times there seem to be other strange effects. Definitely not "it just works." I will try the workarounds suggested here.