Texture glitches.

Heroes V texture issue in Windows 7. All textures are reset, and blurry spots appear instead. Video card: Palit GeForce GTS 250. The latest drivers are installed, and installing DirectX 9 didn't help. When changing video settings in any direction, everything becomes normal, but when changing the location, the textures disappear again.

Added after 14 minutes
Also, I tried installing updates up to v1.6. The same thing happens.