This is a really strange problem, but it seems like when Directional Lights are made movable they only cast shadows when the camera is looking a certain direction.
Here are some screenshots, one of looking straight ahead: http://i.imgur.com/XSPTidl.jpg and one of looking down at the floor: http://i.imgur.com/Or5yBhY.jpg
Does anyone know of a fix for this?
Thanks in advance!