I would like to pick this subject up, even though it's older.
The problem appears on newer NVIDIA Graphic cards/drivers only and it has nothing to do with HardwareTNL actually, although that fixes it by eliminating fog. Yes, fog's the issue. All the zones that are exhibiting this behaviour have fog_minclip=fog_maxclip. This isn't working for NVIDIA cards/drivers.
Change fog_maxclip so that it is larger than fog_minclip and it will work, and you can actually keep your 3D accelerator running with HardwareTNL=true.
-Chris
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