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finally noticed the cause last night, easy to replicate.
duets were disappearing on me and i could not find the issue until now

1) add singers
2) change one singer to a duet in the "details" dialog (eg. make "mike" say "Mike & Jan")
3) saves fine, works fine
4) edit singer details on any other singer (eg. misspelled "Kris" as "Chris")
5) the duet name is gone (now just says "Mike" only again)

the edit singers dialog resets all singers back to what it says after closing on any singer.

Thanks, on it

I need some more info: by 'Details' you mean song details or singer details?

both actually,

1) add 2 singers, "singer 1" and "singer 2"
2) add a song to "singer 1"
3) in song details change the name from "singer 1" to "singer 1&3"
4) change the name of "singer 2" in singer details to "singer 4"
5) "singer 1&3" will revert back to "singer 1" in song details

Version 2.4.0.1 should fix the issue.