I've done interviews both ways (paper and whiteboard), on both sides of the fence. It's never been a big deal. I /have/ seen candidates fail because they insi

I've done interviews both ways (paper and whiteboard), on both sides of the fence. It's never been a big deal. I /have/ seen candidates fail because they insisted on using a laptop. But these folks were typically very nervous about coding, and had essentially pre-failed the interview in their head. Their laptop was a security blanket, a totem that they hoped would sustain them, and it didn't work.