Ok, thank you. I restarted X-Plane and it's working normally again. I think the standard speed indicator was also showing 60knots, when now, after restart, it was on zero. It's like the speeds were "locked" on 60knots? And when I quit XP after the failure, it didn't ask me "Do you really want to quit?", it just went puf, so it was something wrong with X-Plane, not the plane. I think.