[oXygen-user] strange rendering of some Tamil vowels when in TextMode in oXygen

Greetings, I have recently shared some XML files with a friend who has just bought and installed oXygen on a Macintosh. She has sent me some print screens. There is a strange rendering of some Tamil vowels when in TextMode, but AuthorMode is fine. I am puzzled. I have not seen that behaviour in oXygen under Windows. Do you have suggestions? Thanks for your help -- Jean-Luc https://twitter.com/JLC1956