Hello,
Was there an update within the last few days that required a reboot?
Today's date is 05/16/09, so the time-frame would probably be 05/12/09 - 05/15/09.
I saw a message, hidden behind all my open windows, on the desktop, stating that NAV needed to reboot my Mac. I clicked REBOOT, but then realized that I may have cliked a nefarious pop-up instead of a genuine NAV dialog.
Thanks!