So yesterday I got myself an iMac 21.5 and I absolutely love it. I was getting accustomed to the magic mouse and even created myself a hand position I would always use to go back and forward in Safari. Today I turn on my computer and the back/forward two finger scrolling won't work anymore! Scrolling the page up and down with one finger still works perfectly. Checked system prefs, 2 finger scrolling is on. Restarted the computer, nothing. Can anyone help? Thanks!