Hi kmwhitt,
it seems like you are using an OpenGL normal format, so just check the "Flip Y (green)" checkbox. With default settings (all unchecked), the Normal map interprets the textures as DirectX normal maps.
At least it seems so from all the topics here on the forums... To be honest, I don't remember from the top of my head which of the conventions is DirectX and which one is OpenGL.
Edit: I just read that you are using DirectX normal format... In that case, I don't know what could be causing your issue. Maybe flipped UVW coordinates? In any case, if you still have issues with it, we will be happy to have a look at your scene of course.