Thanks Bas Yanone: how do you end up with a UFO file with 10 zones? (just curious)

RoboFont gets a notification for the OS if something changed, so it's pretty fast

Sorry, didn't check that. As soon as I tried to save the file, all direct commands on that very file were blocked because of the saving-process. But I was able to open other otfs. So the programm was still reacting. I'll check next time when it should occure again. Thank you anyway for your quick reaction R

is it possible to send the UFO file to info at typemytype dot com thanks

With a UFO opened only in RoFo, switching back and forth to another app, I get the "external changes detected" pop-up. What/where does Rofo looks for? Nothing was touched.

Damn, without switching on Display Anchors, it's hard to see them ;-) I think I'm set to switch and work mostly in RoboFont, thank you for your help Bruno.