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P3D v4 P3D polygons casting strange shadows onto themselves...

I noticed this slightly back in V2 but now in V4 it seems extra obvious. Whenever I have the vehicle set to receive shadows especially with a reflective material applied, I get these ugly jagged lines bordering the shaded side of objects. It almost looks like z-fighting within the object itself, but that doesn't make any sense because it is simply one spherical mesh with a single material applied.

Here are shots of a "test sphere" that I created to show the effect I'm describing. The second clean-looking one is without aircraft self-shadow, and the ugly one on top is with it enabled.

Is this an issue that's isolated to my machine, or have other designers here been experiencing the same thing? (I've noticed this in other aircraft as well as my own models.)
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