I've had this problem for quite some time now. Before the problem was annoying. Now it its much more than that. I shared a computer with my entire family. We all had separate accounts for everything including yahoo msgr. However when I would sign on to my yahoo msgr account, people could im my sister and it would show up on my screen. Before it was annoying but now that I live on the opposite side of the country you can see how it is now a much bigger problem. Any ideas how to fix it?