I've had this happen before to me. None of the mouse over stuff works; email addresses, web links, dates, etc. Usually I just log off/log back in and everything is restored. My OS and client of choice are Linux (FC6) and Firefox 2.0; haven't noticed it on Windows and/or IE, although I don't use them that often.In the message, I can't mouse over any of the recipients or senders like in the previous version 3.1. The email address don't show only display name.