Musescore playback not working
Steps to reproduce:
1) Start entering notes into music sheet.
2) Continue doing 1_
3) Try playing the score by pressing the play button
4) The play button turns blue, but the score is not playing. Once the problem starts it occurs for all the open score sheets. And it does help to reopen the sheet. The program needs to be closed and then re-opened.
There is no pattern to when the problem occurs, so it does not look like this is a problem with a specific score.