Good, that should be easy to test my theory quickly.
Unplug the USB mouse and let us know if the mouse-overs behave differently when only using the touchpad.
If so, then clean the touchpad by turning off the laptop and wiping it clean with a damp paper towel (water only). Don't push down on it any harder than you do while using it.
If that doesn't work, check to make sure there isn't a hair or something inside the hole in the underside of your mouse where the optical sensor is housed.
Let us know if any of that helps.
Edited by NeverSayDie, 03 February 2012 - 04:24 PM.