So, I'm working on a new map, putting together a few rooms and such, just basic geometry, no lights. I've compiled it a couple of times, loaded it up, tested it out, then gone back to editing. Today, I add some new sections, compile, and everything says it's fine. However, when I go into TF2 and create a server with the map, it gets about two bars into the loading process then dumps me back to the main menu with no error message or anything. Any thoughts? Everything appears to be fine the compile, so I'm really stumped as to what's causing this.