Ok, hopefully this final compile is it. I did a final compile last night and the little "mystery area" where you could see the ice tunnel through the grass (well, not actually see it, but if gl_showtris was enabled, parts of it were being drawn, even though they shouldn't be anywhere close to visible. I added some hint brushes to try to resolve it, and instead it made it worse! A little sliver appeared in the ground where you could actually see through to the tunnel. I found a small gap in the tunnel where the wall met the ceiling. It didn't go all the way through but I went ahead and tried to fix it and soon discovered that when I did, it messed up the brushes on the ground above. Ack! I did a bit of rearranging. Hopefully it's good now. We'll find out tonight.