Thanks. It's fixed it I guess. Looks like somehow it sent new messages to people I had in my sent box. I emptied the sent box, so hopefully it no longer happens. Since it's a web based account (which I rarely use), I'm guessing the root problem is somewhere within Yahoo.
Well I sent you a couple of emails and never got a response so I figured I'd post to get your attention. Thanks for fixing it and I'll send you a note if I get any more.