I just noticed today that an area of my map that I "finished" a while ago had a leak in it. Which is strange, because it's sealed, and I can run vis on it. Here's what I mean:
Exhibit A
And here's what it looks like in the editor:
Exhibit B
Now, like I said, the map is still considered sealed. It won't generate a pointfile, and although I haven't let vis finish because it takes a while now, that will start and complete the base vis without any issues.
So, I ended up fixing it by adding a new brush to cover the area over, but the whole thing made me curious as to what it was that caused this in the first place. Any ideas? Has anyone seen this before, any way to reliably reproduce?
As a side note, how concerned should I be about warnings about things such as efrags and marksurfaces? My map breaks both of those limits and gives warnings on developer 1. Same for missing textures; the console reports 20 missing textures, but I've never encountered them playing the map so it seems superfluous.