I can't know what happened, I will share that the NORMAL.DOT sets such things when Word starts.
I'd delete NORMAL.DOT, start Word (it will make a new one) and see if that's ok.
All of a sudden when I open a new document in Word the letters are a lot thicker then they should be. All the settings formally remain the same and the size is given as 12, but I have to change to 10 for them to get their normal size.
Anyone knows what has happened?