Did you do everything else necessary in the area first -- did you take (and read) Hans' diary, and also read the note from the director?
Are you close enough to a previous save that you can go back and replay this part, just in case it is a glitch?
I still have my game installed. If the above doesn't help, you're very welcome to send me your last dated save file for the game, and I'll load it and see what the problem might be.
"Bleat, Watson -- unmitigated bleat!" ~ Sherlock Holmes