Left click becomes right click
I have a strange problem. Periodically, my left click button will act like a right click button. In other words, when I left click on something, rather than executing whatever command the left click button should execute, I receive the menu of options that I receive if I right click on an object. This occurrence will happen without warning and disappear if I restart. It happens primarily in Safari. I have the latest Safari and Leopard updates, but it has occurred for months.
Any ideas why this happens, how I can prevent it and how I can make the problem go away without rebooting?
Thanks!
Steve
imac 24" 2.8 4gb, Mac OS X (10.5.7)