Many MP3 players just ignore the metadata tags. It’s hard to say why Xojo chokes on it without knowing what library it uses to play media.
Permute clearly has a bug if it’s creating badly-formatted tags. You should let them know. Especially since it’s a paid piece of software.
I don’t know if you really want to try and create a Xojo tag analyzer/repair tool, there’s plenty free ones out there. However, if you’re really keen…
I just used Mp3Tag - one of the greatest (albeit windows only) shareware programs for mass tagging and editing of any tagged media. You could fix all your mp3’s in one click.