Gnome oddity: Mouse switching buttons

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http://forums.fedoraforum.org – I typically have pidgin and amsn, as well as firefox and thunderbird running. Once in a while, the left mouse button ceases to function as the left button, and the right button becomes the left button, or almost.. I wonder if this is a bug, or am I hitting the left-handed-mouse function while typing accidentally?? PS: This is a laptop running Fedora 11. -t (HowTos)