As the author of a program that uses MusicXML as its native format, I'm quite sympathetic to the difficulties of implementing the import/export correctly. And there is the additional problem that in any interoperability problem, it's not 100% clear whether the problem lies with the importer, or with the program generating the MusicXML.

One debugging method I often employ is to round trip the MusicXML import/export of a particular program, but that doesn't help here, as BiaB does not seem to export repeats either (unless this requires some flag I haven't discovered yet). And BiaB exports partwise scores, while my program uses timewise (I'm already grateful that BiaB does a decent job importing timewise scores).

Thanks for the signature suggestion. It's definitely a good idea, though it appears that you're seeing the same behavior on Windows as I'm seeing on Mac.


BiaB 2025 for Mac