Thank you so much Guessed, that's very nice of you!



I'll see if it could be from what you indicate, if not also see if I can't find something in the RibbonX book.

If I have the solution I will indicate it after the post.

Have a nice day,
David

PS: however I have the impression that it comes from the ribbon object, as if the 2, 3... documents opened on the same workstation, shared only one instance instead of having each one its own.

... just for the record, I just checked something: the error is only caused when the opened documents have the same basic template (.dotm) used when they were created. If it's not the case, everything works fine. I will ask the user to close the opened document, if the second document he wants to open has the same basic template.