I have 2 MBP's, a Mac Pro, and a Mac Mini. On all of these I use a Logitech Trackman Wheel with. I updated the first 3 machines to Snow Leopard and the Logitech Trackman Wheel continued to work fine. I then upgraded the last MBP to Snow Leopard. For some reason the scroll wheel no longer works on the Logitech Trackman Wheel. I am able to use the ball to move around the screen, the buttons still work, but the scroll wheel won't work. Any idea why this would happen? Thank you for your help.