More updates! Turns out he has the same issues that I do in levels other than Example_Map for this project. Copies of Example_Map work, but new ones based off of Default or Empty level are borked.
Here’s a screenshot based on Empty Level, with just a few BSP objects and a point light:
Same result regardless of static/stationary/movable type. Rotating the point light has no effect on the lighting (it always points -x on the ground).
For engine version, we’re on 4.3 with a few config file changes. There are a couple of patches that we could rebuild with, but it looks like they’re all unrelated bugfixes.
I’m fairly sure this was working in 4.2, but it’s possible it showed up when 4.3 came out and we just now noticed when we tried to add levels.
Both of us have HD 6870s, I’m on AMD driver packaging version 14.10-140415a-170730E. He probably has a slightly newer version.