The problem is that something like a "shadow trail" appears on the wall and floor where the objects intersect. It looks like layers of shadows bulking up from all the frames. I've tried with and without ambient occlusion, standard or physical, IC + QMC, light mapping, with or without moving camera or without camera at all, different file exports etc... I've tried literally everything and still no solution. I don't seem to have problems with flickering and stuff like that but this "trail" is unavoidable. Any ideas?