Hey, I've got the same problem. Really frustratingly, I'd just gotten to the room where you mix chemicals *yesterday* and thought "I'll leave the end for tomorrow's lunch break". Then today I boot up steam, wait for that unexpected game update to finish, and then find that by leaving it for today I've made it impossible to finish. Doh!
Ah well, fingers crossed it's a quick fix
I've attached my log file, hope it helps you guys out. Love the game, for what it's worth!
Oh, and my system specs are...
Athlon 64 X2 4400+ (2.2Ghz)
2GB RAM
NVidia 7950GT 512mb
Onboard Realtek HD sound
Windows XP 32bit SP3
As previously mentioned, it's the steam version of the game.