Directional Lights Do Not Work with light baking / Beast?

I'm working on light baking scenes, however I'm finding that any and all lights that are directional refuse to show up in the bakes. To make this stranger, if a light was originally created as a directional light, then had its Type changed to Point, it also will not show up in the bake. Point lights created initially as point lights however will show up in bakes just fine.

I'm a little unsure where to start here, so my first question would be - what would cause directional lights to never bake...

Directional Lights Do Not Work with light baking / Beast?