@plutomaniac: thanks for the tip man, I just tried the halo fix but it didn't help
There's something I didn't mention before which might help narrow down the source of the problem; the enemies aren't bright white ALL the time, just
most of the time. For instance, when I was taking those screenshots the proper enemy textures would appear briefly when I moved my cross-hairs around a bit. There seemed to be a "sweet spot" where I could make the proper textures appear. When the enemy is really close to me - like, staring me in the eye - most of the time the proper textures are there, but not all the time.
Another strange aspect of this problem is that it seems to affect the Grunts a lot more than the Brutes. In the Choir the Brutes didn't seem to turn white at all, but in the sewers they did. The Grunts, on the other hand, appear white
everywhere.
When the enemies are white you can see them from the other end of the room/level clearly, even when the level is extremely dark (like in the Storage). They are unaffected by lighting/shadows and despite their extreme brightness they don't emit any light onto the environment themselves.
My settings in Amnesia are as follows:
Resolution: 1280x1024 5:4 (native Desktop resolution, along with the maximum 75 Hertz refresh rate for my monitor)
Texture Quality: High
Shadow Quality: High
Shadow Resolution: High
Fullscreen: On (windowed mode has the same issue)
Texture Filter: Trilinear
SSAO: On
Edge Smooth: Yes
World Reflection: On
Anisotropy: 16x
SSAO Resolution: High
SSAO Samples: 32
Parallax: On
Vertical Sync: Off
Shadows: On
Bloom: On
ImageTrail: On
Sepia: On
RadialBlur: On
Insanity: Off (happens when On, too)
Smoothing: On
Refraction: On
World Reflection (Water): On
I've played with and without cheating (i.e. editing the save files to increase health, sanity, etc.) and the problem occurs in both instances. I've also edited my configuration file to switch off flashbacks; the problem occurs when the flashbacks are both on and off.
I haven't tweaked my GPU or the drivers at all and in fact don't even use the Catalyst Control Centre or its game profiles. Everything is "stock". That's true of all my hardware - no overclocking or the like. Windows is fully updated, as is Steam. DirectX is up to date, too. I don't use real-time antivirus software, so there's nothing interfering with the game in that respect. No malware either; I scan regularly with several different programs.
I don't have any issues with other games so I hope that rules out the possibility that my GPU is dying!
Thanks for your efforts fellas, even just reading all of this is worthy of 100+