I would say everything is possible but typically D3D11 would output something like: "D3D11: ERROR: ID3D11DeviceContext::DrawIndexed: Vertex Shader - Pixel Shader"
So it is pointing in to VS input. But in my experience sometimes even D3D is confused. So theoretically the error could be everywhere and most likely at a point where you normally would never look for it.
This was the problem that we were afraid of. We almost were hoping it was a numerical issue rather than having to deal with a "needle in a haystack" situation. Telanor should be up 3 hours, I will make sure he sees this once he does and we can go from there. Thanks again, both of you.