Aquarium got the cold shoulder for a while after its feedback thread got eviscerated; I needed some time to sit on it and think anyway, and that just gave me the excuse to do so. I think people will be surprised by how little has changed in the eight months between versions, but I really didn't touch Hammer much in the whole period besides working on 5cpass. I solved oddly bright lights, added some helpful geometry, and fiddled with some stuff. I don't remember what I changed. I paused work a couple weeks after a15, but had already done some stuff by that point and now I'm uncertain as to what is new. Let's hope this is a step in the right direction.