Yes, thank you (Kilroy), I believe this was the same glitch that has happened to me twice now during the last weeks. About what Stefan was saying (thanks), it's hard to say why this is suddenly happening. I have the same laptop as last year, and last year I typed and published a 300-page book, without ever once having any kind of glitch. So, now I'm saving way more often than usual, and having to do creative writing with the fear of the glitch always in the back of my mind. I'll update the video driver as Stefan says. Thanks