Certain instruments not playing back in a particular project

Sketch 2 number 3.dorico (1.6 MB)
Hi everyone.

I’m relatively new to Dorico and while playback works well most of the time, I sometimes run into strange bugs. Sometimes I have projects where certain instruments just won’t play back.

In the attached file, the celli play back fine. But I don’t hear the harp or the flute. It seems to me HalION is loaded. Any help?

Welcome to the forum, Victor.

For whatever reason, the channels you’ve assigned in the Routing section of the Track Inspector are pointing at empty slots in HALion Sonic SE. The simplest way to fix this would be to go to Play > Playback Template, choose HSSE+HSO (Pro) from the list of templates, and click Apply and Close to reapply the default sounds.

That fixed it. Thank you so much for the quick reply!