The problem where the mouse wheel zooms in and out instead of scrolling usually occurs when the Ctrl key is stuck. However, there are other causes too that can trigger this problem. You can try the ...
As described earlier, it is the middle mouse click that changes the mouse pointer into an arrow with a vertical scroll bar. Before you try the following suggestions, click anywhere on your screen and ...
Speaking only of the default Windows & OSX mouse drivers...<BR>When I use the mouse wheel to scroll in OSX (10.5) it seems to be able to detect whether I "flick" it quickly, or slowly turn it.
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