Yesterday morning when I flipped this one it revealed a split in the rind. I've had this happen only once before, on a butterkase to which I was adding a b.linens wash. So this has happened twice now, and both times to semi-firm, lightly pressed cheeses, which I've washed with a brine and b.linens. I suspect it's the brine in the wash rather than the b.linens. Because the box is quite humid (condensation every day), I don't think it's too dry. Rather, I think the brine wash pulls the moisture out of the surface of the cheese, but given how humid the box is, that's all that happens. This creates the dry surface relative to the moist inner cheese, which is what happens if the environement is too dry.
To compound this, the cheese was sitting up on a layer of chopsticks to allow air to circulate. But, the cheese also sags between the sticks, and this stretches the stiffened rind, and it splits.
Anyway, I've put down a layer of needlepoint matting to remove the sagging between the chopsticks and we'll see what happens.