ATI HD Problem: Beta hotfix available - UPDATED 11/6

[blacksheep242]

I've done everything listed but still have invisible walls and long out of place "spikes" textures. I am using an ATI 3850AGP with the latest drivers. I downloaded the game from Direct2Drive.

I had the problem earlier, came to this page and followed the directions and the problem went away...temporarily. Fired the game up again and it was messed up again. Re-loaded the last save and it was fixed again! Now, it is just permanently messed up.

Any other suggestions?

Thanks in advance

Oh yeah:
P4 @ 3.6GHZ
AGP ATI 3850 (512MB)
2GB DDR
Windows XP Pro (SP3)
All non-essential background processes killed prior to gaming.