Mouse won't scroll up or down since updating my OS to 10.11.

I put El Capitan on my Mac Pro the other day, and ever since I can't scroll down or up using the trackball mouse I have.  (Logitech mouse).

 

Any ideas why?  Can I fix it somehow?


Mac Pro (Early 2008)
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I tried the reset, but it didn't help.  Guess I need to get a new mouse.  Thanks.

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