That's sheer speculation of course, but the Facebook redesign launched
and suddenly we're having problems playing Mafia Wars
-- namely, the right-hand scroll bar in the game is missing. With only half the game accessible on screen, that means jobs can't be completed and no one can check in and see what friends have been doing in the game.
Zynga's mobster game has some scheduled downtime this afternoon, so we expect the case of the missing scroll bar will (hopefully) be solved shortly.