Outlook 2003 SP3 on WinXp SP3

Hi all,

I have a user that is experiencing a strange issue in that when she sends a email it sometimes loses the subject line. I have watched it happen, seen her enter the subject line and send it, and when you check the message in the send items the email is there, but the subject line is blank. It seems to happen most often if there is an attachment on the email, but not always...

Any ideas what could be going on?