Collection/Black Plague - Freeze when leaving chemical laboratory

[hiben]

Just for the record: I took a save-game from just before 'meeting' Amabel and then went very straight trough the game (not so scary the second time ;-) - the freeze 'timeline' included many visits of the gas leak and general looking around in the corridors).
Whatever caused the freeze seemed to have not occured here.

Now I'm done with black plaque and need to play again to find the remaining collectables ;-)