Were the glissandi selected when you unchecked Properties > Common > Suppress playback?
Another thought - could it be affected by the C naturals and G natural not being in the pedalling diagram? To test this, select everything and add a sharp to them ( press" = " ).
The only other thing that I can think of is that the C’s and G might actually be C and G natural but with the accidental hidden (Properties > Notes and Rests > Accidental > Hide).
Thanks, Steven, your Dorico file does indeed play back just fine.
Weird. I’m going to try pasting it into my score, see if it works. If it doesn’t, I’ll isolate the glissandi in my broken score and save it off. (Perhaps someone will be willing to open it and diagnose it.)
EDIT: Pasting it into my score broke it. No more glissandi playing back.
Here’s my Dorico file: harp_gliss.dorico (504.9 KB)
Actually, I just figured it out. Was happening because the separate staves of the harp were assigned to different playback channels. I’m not sure how that happened, but setting them to the same channel fixed the problem. Thanks for trying to help me, Steven.