Yeah, I've loaded the .lin in hammer, and it's a huge jumble of lines that are so chaotic I can't follow them. The red lines don't show up in the 3d view, just the 2d views. I can't easily tell where the lines are passing through just looking at the 2d views, because that would require insane cross-refrencing. But I can say for sure that there is not a leak everywhere the lines appear to pass through a brush. If that were the case, there would be over a hundred leaks, and that's just not true. I've built this map very carefully and the red line is going nuts through large areas that have compiled successfully before. I have not changed those areas. I have only added a new hallway that could potentially have some geometry parsing problems, but I'm unable to find any by just taking a look at it.