I'm sure I've read about this somewhere else, but seing it hasn't been fixed yet, I assume it has been forgotten (or regarded as unworthy to fix), so I'm gonna post it again
There's a bug at the end of the Pillared Hallway on level 9. The texture of a pillar flickers when you look around. The flickering goes on for some seconds and eventually stops (if you don't move anymore).
I uploaded a vid so you can see it first-hand : (allow some seconds for buffering) http://pheryllt.de/_misc/LegendOfGrimro ... ipping.mp4
Cheers,
PSY