At work, I open a few threads at a time in separate tabs. Sometimes when I close one tab, 10-15 new tabs open of the thread I just closed. It's not in any specific forum, and it just happens at random times. First noticed it maybe a week ago and it's happened probably 5-6 times. I'm using IE7 when this happens. I use Firefox at home and have never had a problem with it. Any ideas?