There is an area in one of my map's skies that if I look at it in first person mode it crashes to desktop, but if I look through third person it doesn't do anything. Has anyone ever heard of anything like this?

Are you sure it isn't just when you switch to first person mode. Also, is it a consistant crash, because it could be something faulty like a vehicle and someone coinsidently entered at the same time.

I'm guessing either the view distance in your sky file is too high, or the view distance and LOD distance in your game settings are set too high.