Okay, I use photoshop CS4 all the time until recently, the brush has been acting very strange. It is stuck on the eyedropper tool as if I'm holding down the alt button. After tapping a few times it switches back to the brush, but sooner or later the eyedropper gets used again, and it really takes a toll on how I paint. I've tried reseting all the settings and even uninstalling and reinstalling photoshop, but it still does this and I don't know what to do. Does anyone have any idea as to how this can be fixed? 