While constructing score for Vivaldi Gloria, I ran into a problem where voices holding a slurred long note (specifically in measures 45-50 of #1, Gloria in Excelsis) refuse to turn off or change entering measure 48. The voice notes of measure 47 carry right on even through the rest measure when only the piano/orchestra is playing. If I start on the middle of the slur, measure 47, the voices shut off properly. The "instrument" was the Voice on "Aah". It happens also for some other instruments, but not for the default. I don't know how to attach a NWC song to this message, but I have a little abstract of this problem which behaves just like the full score.
Check out the Common Questions section of the help file, section "Play and Sound Application Questions", question #5, "Why does a note sometimes keep playing all through an entire song, as if it were stuck on?"
This is also discussed on our web site at:
https://noteworthycomposer.com/composer/faq2.htm#stuck
See also: https://forum.noteworthycomposer.com/?topic=846