I'm afraid I can't recall. Very busy day. I do remember checking and it was more than one thread. When I went to report it in this thread, I noticed it was no longer there. Went back and it was no longer happening. Perhaps my machine? I always customize the software I use. Still, standard FF 5, Win 7 up to date. Sorry to trouble you. Perhaps not worth fretting over. If it happens again, I will be more specific.