Q: trackpad not working after lion 10.8.3 upgrade

Portables and Magic Trackpad: Jumpy or erratic trackpad operation

It seems like just after upgrade to the latest software version I am having my mouse FREEZE after I stop using it for just a few seconds. I looked tis issue up and from previous posts on teh forum they siggesetd getting rid of certain files which I have treid and the problem sill presists. This is so anoying. You have to keep fiddeling with your track pad to get the mouse to work again. I never noticed this before and cannot believe that I am the only one with this problem. Is this an OS issue? If so it needs to be fixed immediate attention.

I recently just reformatted my Macbook pro and my trackpad stopped working after I logged in, I could see the mouse arrow moving around but I could not select by pressing the pad. What eventually worked for me was 1st: Pressing hard on the trackpad and applying pressure all across the surface. 2nd: After pressing on the trackpad surface for a while I found out if I pressed hard enough I could select but it was a pain pressing the **** out of the pad just to make a selection so I went to "Preferences" and then selected "trackpad" and then selected "Tap to click" and it started to work like it use to, but I ended up having to use 3 fingers to select and drag..which was annoying as ****. So I went to "Preferences/Universal Access/Trackpad Options/ and select "Dragging". That worked.

Also try: Shutting down computer, plug it in, then start pressing Shift/control/option while pressing the power up button for 15 seconds and when you let go the light on your power cord connected to your Mac should go to green then back to orange, then power up your mac again.

Also try: Command+Option+P+R while you power up your mac and wait til it chime 2wice ...then start up again.

Hopes this helps....someone, I know how it is!

I have the same issue.  APPLE, please find a fix for this ASAP .  I don't want to call you CRAPPLE.