L4D2 Level - Crash to Desktop

[Griffinclaw]

Hey guys,

I posted this over at the Valve SDK forums, but I figured I'd put it out here as well to see if I can get more eyes on it.

I am working on a survival map that takes place in an office building with a courtyard on one side. When I was building the level, I originally kept the courtyard sealed off while I focused on the inside. I got the level built up enough to be playable, and then decided to open up the courtyard to spawn infected so they would smash through the glass windows and spill into the building.

Unfortunately, I must have done something around that time, because now when I'm playing the mode, the game will randomly crash to desktop between 3-10 minutes of playing. I don't get any error messages, nor do I know of any crash logs that may have been recorded, so I currently have no clue what is causing it.

I tweaked a good amount of the map before I ended up "enabling" the courtyard, such as adding an ambient sound (I put a crying witch sound behind a sealed door as ambiance as well as a joke on a coworker), and a couple cubemaps. I also started using NoDraw in any areas where you cannot see (including on the hidden sides of glass).

The first thing I tried doing was sealing up the courtyard again and deleting any nav mesh areas on the outside of the building. I then tried deleting the ambient sound as well as the cubemaps (I know I didn't set those up fully anyway). However, I still can't figure out what's causing it.

I posted my compile log at the SDK forums, and I also checked them here and there doesn't appear to be any errors.

Any ideas on what could be the culprit, or if I can get/provide any more information? Thanks all.