That strange muffled sound you're hearing is me talking around my feet...
New version loaded painlessly. Re-tweaked my graphics settings, ruthlessly dialing everything but ground detail range, which I put about in the middle. Then I cranked gamma up from .9 to 1.2 since my biggest problems were all the invisible bits in the shadows. Away goes the contrast, and while some elements are washed out some of the scary bits hiding in the shadow are now visible. Gun emplacements are still a pain, but at least I can see them when I'm close and have points of reference when I'm not. Frame rate is improved at 36ish most of the time. Still get some pretty irritating flare, but not as bad (I think that's because the sun is higher; be interesting to see the impact closer to sunset).
In any event, my issues have mostly been PEBKAC (Gamma. That got added in WHICH version of AH1? Shortly after the wheel was invented, I think...).