That’s a bug with the blur, I really need to fix that.
Also, you may get better results by lowering a bit the voxel size, and making the rays a bit longer (play with the sample counts / sample displacement).
Thanks for that screen, it helps to point out some of the issues AHR has, that doesn’t appear on all the scenes.
Also, you get better results if you have normal maps on the surfaces, helps add detail.
Hope to work on all that after the 10th
EDIT: Another thing is setting the ambient color to something that matches the color you want on the walls, instead of the gray it defaults to. That should help a lot.