Oh, I know. I haven't even added detail brushes, yet. I only have texturing, or system/caulk. (I do have a water-caulk on the first room, but those problems were fixed long ago. I really can't explain what happened. It just... did. It wasn't a complicated room, either.
That room has platforms to force-jump across, with fatal falls between. I violated the Law of Good Architecture and made the room a perfect cube. It had little more than -700 light, so why bother making it look good, right? Anyhow, the problem started after I cut open the wall to make a doorway, but the leak was in the middle of a piece of wall. Go figure...