Thanks Tim, it definitely helps to know that at least I’m not completely off track with my lighting setup.
I’m aware of the LPV visualization feature and it does help to understand what’s going on under the hood. But so far I didn’t have any luck using that information for actual debugging. The LPV settings listed in the documentation don’t seem to help with this particular problem.
But as you said, the feature seems to work much better in an “organic”, more detailed environment. Maybe once I replace the cubes with the final level geometry the problems will solve themselves. Otherwise I’ll just wait and hope the tech from the GDC kite demo will make it into the next update! 