I am doing some testing with irradiance mapping. Haven't used it enough to know if there is a bug so am asking if others have seen simular issues. I rendered a little test scene to save a map with static settings, no interpolation...skylight and caustics. It rendered fine, but when I went to use the save mapped this is what I got. It could be a caustics thing...Just started using it so still pursuing.

No need to think outside the box....
    Just make it invisible.