I haven't been able specifically identify the problem, but it seems to happen with copying both notes and lyrics. I can't say it has never happened with a song with just a melody, but I really don't remember it occuring.

It's very frustrating and all you can really do is fix it, or if you are lucky,go back to a previously saved copy. In these situations, I also find it safer to restart BIAB simply to ensure that any residual copied data is cleared.


BIAB for Windows Version 2019 (643)
Windows 10 (1909)