Hi, Tony,
Your friend could try to select the area where the text is supposed to be, and copy to clipboard, then paste into a plain text editor. It's possible that rather than the text going away, it (or the background) got switched so text and background are same color. Black-on-black used to be a frequent problem with KDE version 1 in 1990's RedHat releases, when you tried to set up a dark theme.
Douglas
Hi Douglas Thanks for the reply. Yes, my first thought was that he was editing something and that it went wrong there. That's why I asked more info. ( I don't like guessing ! ) I did a search and you are right, there were entries about it.
And btw, it was Baron's friend :-)
Have a nice day Tony