Kerbal Space Program

When the sun sinks behind the VAB at KSC, its shadow fades out partway up the screen, dependent on camera elevation but regardless of camera azimuth.

The first screenshot (attached) shows the broken shadow, with the relative positions of the sun and VAB for reference. The second screenshot shows a better view of the bug; note how the shadow starts at the expected place, but then fades out toward the VAB, leaving the area close to the VAB in ordinary daylight. The third screenshot shows how the bug manifests regardless of camera azimuth -- note how the sharp shadow edge parallel to the VAB on the left side of the screen changes to a blurry edge, whose Y coordinate is affected only by terrain height, when it reaches the crawlerway.

My rendering settings are:
- Render Quality: Simple
- Texture Quality: Full Res
- Aerodynamic FX Quality: Normal
- Edge Highlighting (PPFX): disabled
- Surface FX: enabled
- Underwater FX: disabled
- Orbit Line Fade Strength: 100%
- Orbit Line Fade Reversed: enabled

In case it's a hardware-specific or driver-specific issue, I'm using an NVIDIA GTS 450 with the NVIDIA driver version 367.18.