There is a playback problem with switching instruments on the same staff
When there are several instrument changes on the same staff, musescore stops playing some instruments.
This usually happens in percussion lines, as I use this function a lot. I didn't test it with melodic instruments, so I don't know if this also happens with these staves.
But the instrument simply goes silent. To be able to hear it, I need to create a completely new staff to only reproduce that instrument and hide the staff from the score.
Comments
It would be nice if you explain in which OS You work and which is the MuseScore version You are using. In order to check/correct this problem, it is important to have a score showing this problem.