I'm having a problem playing back songs. When I select a song, no matter which I choose, I only hear the drums.

I can see in the mixer that there is audio meant to be playing on other instruments, but there is no sound, despite nothing being muted. If I solo individual instruments, I don't hear anything - only the drums will play if soloed.

On the mixer, the drums are green, but all other instruments are yellow - does this indicate missing files?

When I check the track settings for the other instruments, all tracks are enabled.

I have version 2018 UltraPlus Pak for Mac.

Can anyone help?