For the past few weeks, occasionally when I click on something the click doesn't register at all or sometimes only the down click works. I haven't had mush trouble when clicking in Finder, but this happens about half the time in games and Safari. I made a test account on my MB and everything works perfectly in that account. Are there any settings or preferences that could have been messed up and caused this problem? I did have some Logitech drivers installed when this started, but I've never had trouble with them before. This is on a late '07 Macbook with 10.6.3.