In situations like the attached screenshot, I get glowing reflections coming from corners that should be dark, i.e. on the ceiling. I have no artificial lights active, only sun, set to 10 intensity. No matter what I do to adjust scene and material settings I cannot get to the glow to be removed. It appears to be affected by time of day, with afternoon sun causing the most irregularity.
Thanks for the insight. I cannot use Path Tracer due to being a mac user.
The second screenshot below shows how changing the Effects setting to High from Ultra results in a significant reduction of the problem. Shadow bias is set to 0.10 for both.
