I think they edited the intro room in the 1.0.5 and 1.0.6 version. You said that you had moved textures, sounds and INIs. Did you moved th lightmap textures for the rooms to? I think it's looking weird because they edited the lightmap of that room. You need to use the old lightmap textures to fix it(I think this is the issue, I don't really know).
(sorry for my bad english)
You mean ".bmp" files right? I tried, but it didn't worked :( However, the problem is in map folder.
I moved files, there reads lm too.
(my english sucks too
)
EDIT:
Yes. I moved old version of 173bright_opt.rmesh to new. I hope it doesn't produce crashes or freezes. But it worked now
I'll edit and fix some sounds and textures and then I release 1.0.6 version of mod