I got the 'become a vm' message today while trying to spray on badwater during setup. It worked during the rest of the round, though. I dunno if this matters, but I was on blu team, medic class, first map of badwater.
Edit: Worked on upward with the same setup. Also, the green star doesn't work when you're dead. It usually works in allchat, but doesn't show up in teamchat half the time.