Playback disabled; can't enable
When I open MuseScore (recently updated to 3.5.2), I can't hear any sound coming out of it. I know there's a setting for playing the notes as you put them in, and I typically have this turned on, but no sound is coming out when I put in new notes. The playback settings (Start/stop, Metronome, MIDI input, back to start, etc.) are also greyed out, meaning they're disabled. I don't know how to enable them. Can someone help me? Thanks in advance.