Well, my map is crashing during the VIS portion (using CoDBuilder).

Error signature:
AppName: q3map.exe
AppVer: 0.0.0.0
ModName: q3map.exe
ModVer: 0.0.0.0
Offset: 0002d27c

I suspect it has to do with either a model that's out of place, or a brush that's funky. Here's a sample from the compiler output (with verbose option turned on).

File Handles:
----------------------
30054 files in pk3 files
reading C:\Program Files\Call of Duty\Main\maps\mp\StorageBunkerD-006.bsp
reading C:\Program Files\Call of Duty\Main\maps\mp\StorageBunkerD-006.prt
27 portalclusters
36 numportals
150 numfaces
72 active portals
0 hint portals
visdatasize:224
0...1...2...3...4...5...6...7...8...9... (0)
2 average number of passages per leaf
0 MB required passage memory
0...1...2...3...4...

At which point it crashes. Once I dismiss the WinXP "app crashed" dialog (where you can opt to send info to Microsoft), the compile window continues on to the next steps and I can actually load and play the map. Everything in the map looks normal and I can't seem to locate the error. Probably crashing during what other versions call the "CreatePassages" section, but it doesn't say.

So now I get to play the "delete stuff, try compiling" method of locating the error. Started with a bunch of detail brushes (crates), then deleted some more, and more. Finally, I deleted some models (chair, 2 trucks and a barrel) and then the map properly compiled.