I have a simple level (third person demo, except I re-built the floor/walls using BSP blocks)
The sun and skylight are the same as in the original level, with sun intensity pulled down from 10 to 2.75.
There are a few additional point lights with small radii, marked “do not cast shadow.”
These lights are one red, and three yellow (for the pick-ups on top of the blocks on the right in these images.)
The problem is that “static” or “stationary” lights do not cast shadows onto the ground, even though they do cast shadows on the walls.
If everything is fully dynamic, shadows are correct, but there is instead a weird cyan lighting at glancing angles on the blocks.
After each change of the directional and skylight, I re-bake lighting at the Production level.
See the screen shots below: