In academy, if I click (instead of drag) character, the character will stuck on my mouse.
EDIT: and it seems causing memory? leakage. After I click it and back several times everything is stuck and i can do nothing but alt-f4.
It is rare case but call signs should be different, although they can go away and back.
> get into vehicle
> a sharp turn> too fast to do the turn> crashed> ... out of the map