I didn't play the maps yet, but I saw on the Steam forums you have trouble with reflections. You should post that question here in the Hammer/Modding or PTI section. I think this forum is frequented by more people that could help you with that than the Steam forums.
Thanks for noticing and telling. I did search the forums here before I posted on Steam and sadly it looked like workarounds for PTI are not even remotely discussed or thinkable. With Hammer there are resources but that would be a little too much trouble for that problem. Rather chose to live with it. I didn't think the Steam Forum would help either, it was just a shot in the dark.
That was my guess too. But editing the map down did not enable reflections again. The design is pretty much identical to the other two maps and they work 100 %. It's probably the PTI source file that is mildly corrupted. I have another published map where the PTI file is corrupted in a way that it doesn't build anymore under no circumstances, so I can't update that anymore and if a serious flaw was detected in the puzzle I would need to delete it. These things just seem to happen. But you are right, I it wouldn't hurt to post the problem here again.