Thanks to the guys at the HL2World forum, I have been notified of an error with my map, Source Chariots. There is apparantly a bug that crashes the game when you exit the Prisoner Pod. I’m not sure what the cause for this error is, but I will be looking in to it and I have emailed Valve about this as well.
I would simply just recompile, but there is another error that causes displacements not to clip objects right now, so I can’t simply just re-release the map. Sorry guys, I will post as soon as I know something about this error.