HALion not sounding

I have one orchestral project where HALion is not sounding for some reason. I do not have any problems with any of my other files. Any ideas please?

I would check the settings of the Halion vst, clicking on the round e in play mode. It opens ghe Halion editor. Make sure it’s correctly “wired” — each corresponding channel has an instrument loaded and so on.
Well, now that I think of it, there is an automated function in the play menu : reset to default playback instruments or something like that. Have you tried that?

Thanks Marc. I discovered that the player had been inadvertently switched off in the right-hand panel.