Hi there! Thank you for reporting it. I did check Neil's chapter 27 and it didn't open for me either, so I managed to fix that. However, Neil's chapter 17 worked fine for me. Are you positive it is chapter 17 that is giving you issues? I cannot seem to replicate it.
If you know at which point it happened for Dimitri's route, that will help narrow it down too! Was it near the beginning or near the end?
Edit: turns out it was Neil's chapter 19 that the curtains never opened :)