I am a huge fan of this game and was able to complete it three times now without experiencing a major bug.

Now I am on my fourth and last walk through the game, and suddenly I have a huge bug/problem...

It is chapter 9 when I, as Sarah Hawkings try to get rid of the Shambler. When I enter the third glyph, I am rooted I can not run away from the shambler, I can turn on the light, turn around, but cannot move (in no direction, I have tried this). What is the problem here?