Latest update gone wrong
Loading MuseScore 3 this evening, I was invited to update to version 3.0.3. Everything appeared to go well. However, when I came to play back the piece I have been working on by hand slowly for many months, I found that all the instruments are now playing back as pianos. The staves remain labelled as the correct instruments, and the mixer desk has all the correct labels. Everything looks correct, but the playback sound has been reduced to lots of pianos. Have I done something wrong? I shall feel extremely demoralised if I have have to write out the work again. Is there guidance to be found?