Game deadlocks on a map created in the Editor.

My newly-created map: Cavernous

When loaded, the game locks up completely within a couple seconds. I am willing to entertain the notion that I made a mistake in the map, I simply want to know how to figure out what that mistake is so I can fix it. Unfortunately I do not have any crash logs to provide for you, because the game does not actually crash. It simply deadlocks and never responds again, even the rendering thread stops. Music continues for the current song playing, but never selects a new song afterwards. I can attach additional files if you need them.