I feel that I am at a disadvantage without it. I've tried resetting it to original settings, cleaning it, new batteries, switched device channels and shit. It still works when I click it down and can scroll with the direction of the cursor. WTF is wrong with it??? its a logitech cordless optical mouse.
Take it to Walmart and return it. Even if you didn't buy it from there, say you got it as a gift and don't have a reciept, guaranteed they'll take it back. (I know, I have done it many many times) If they don't have one like yours in stock, they'll give you the newest/next model up.