I have been going back and forth in maya by exporting the scene in fbx and using that to create new props for filling in gaps… so no problem exporting… and it seems like a large portion of the level does that flickering thing… probably everything. But cant say for certain. As I said, before last nights light build… i did not have this problem… i was just optimizing it further… trying to remove lightmaps from some vegetation and have it be dynamic lit… and combined some background buildings into seperate combined meshes.