I have an older MacBook Pro running system 10.4.11. Yesterday, I started having strange trackpad behavior where it will sometime act as if I double-clicked when I only clicked once. So I'm highlighting everything until I double click again. Then, I sometimes have to double-click in places a single-click is supposed to work such as closing windows. I've rebooted, adjusted a track pad settings and don't know what to do at this point. Any suggestions?