When reporting these issues, it's best to post what type of systems you have as well as live/PTR screenshots for comparisons. Can you tell us more information about your computer? You can find most of the information if you go to Start -> Run -> dxdiag (or on Windows Vista, Windows Key + R -> dxdiag)

I'll need the following info:
System tab
Operating system:
System Manufacturer:
System Model:
Processor:
Memory:
DirectX Version:

Display tab
Device Name:
Driver Version:
Driver Date:
Driver DDI Version:
DirectDraw Acceleration:
Direct3D Acceleration:
AGP Texture Acceleration:

---

Q u o t e:
Bumping to get this resolved.

---

Screenshots would help. Since it's also happening on the older d3d9 and OpenGL engines, do the shadow settings and others affect the lighting?

This is currently being looked into. Unfortunately we do not have an ETA at this time.