Oh my! I just got this very ominous mesage:
Beware the Elementals
Young Wizards, we elementals; Fire, Storm and Ice, have decided to play tricks on the Wizards of the Spiral.
We are disappearing from your combat circles and playing havoc with your vision but I'm sure Merle will put a stop to it very soon.
Until then, you may not see us, be know that we are there...
Good to know . . . I think I'll go log on the game now and take down some invisible elementals.