Sticky trackpad fix!
I had the same annoying as hell sticky trackpad issue but I seem to have found a solution:
Plug in a mouse to the computer and use the mouse instead of the trackpad for all clicking and dragging for a few days.
This seems to have solved the problem. Maybe it resets the trackpad in some way.
After a day or two with the mouse, return to the trackpad and it should work again.
The issues did come back with the trackpad after a few weeks but I did the mouse trick again and once again it fixed the sticky pad.
A few thoughts on the sticky pad issue. It is a software issue and NOT a hardware issue per Apple. Here are the fixes I read about and tried with NO success:
* place all five fingers on trackpad at same time
* reset PRAM
* clean track pad
* change trackpad settings in "preference" panel.
* and a few more I can't think of
basically I tried everything on all the board until I gave up and decided to use the mouse and inadvertently fixed it!