I have finaly goten up to where Cet casts Twisted Master on Kerah at the 2nd portal of Isis.... but soon after (like 15 secs) the games frezes.. in fact the whole computer does.... and it is realy shitin me off to come this far, just to get this bug!..... i have heaps of Hoyl water to use... both champion keys.... and am aching to finish the game.
If anyone has encounted this bug, or has any ideas how to fix it PLEASE help me out here!

A lot of people have hit this bug, myself included.

I found that when I just skipped that room and went on to do other things first, it helped. Save a lot before the freeze happens
Mine froze twice this way, on the third load I got past it though.