My mouse scroll button only moves up (not down)

My scroll button on my Apple mouse (brand new iMac) was working beautifully. All of a sudden, it will not scroll down -- only up.
Can someone give me an idea as to what might be wrong? (I checked my mouse preferences and the setting is correct, "vertical and horizontal").
Thanks in advance.

OK
I have the same problem with my wireless mouse which isn't dirty, because when using it with a CAD program which uses the scroll ball as zoom in/out it works fine.
Maybe it stopped working with the latest upgrade?.

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