Piccolo / flute part - only piccolo sounds in playback -

I have a player switching from piccolo to flute, switching back and forth a few times. It’s all marked correctly on the score. However, during playback, I hear only the piccolo. I reapplied the playback template but that did not fix the problem. If I delete the piccolo in the player’s box in the setup window, it will delete the whole part, I’m afraid. Any ideas on how I can trouble shoot this? Appreciate any help - under a deadline.

Looks like it’s fixed for now. I switched the flute part to a new instance of Halion and new channel and that seemed to do the trick. I worry this problem might occur again once I close and reopen the program. If it happens again, I’ll update here.