Ok guys this is rather strange and i can't find a single post about this problem!! I am running 10.7.3 on an iMac and i am using a magic mouse. Sometimes when i leave my Mac unattended i am using the Fast User Switch menu to return to the login screen. (I am NOT logged off). If i will leave my Mac unattended for a long period of time, i am doing the exact same thing, but i also enter sleep mode. Now, in both occasions, when i log in again, i am facing a rather strange mouse behavior. Right click does not work! (not by hitting the right side of the magic mouse, not with ctrl..) The only way that i can make it work, is to open Mouse Preferences, uncheck and then re-check the Secondary Click! This restores right click functionality. Anyone else has this problem, or i am alone? Thanks.