Unfortunately, "Go to definition" (as well as all other options near that, except for "go to header") are grayed out. It doesn't even show me the definition if I hover over it, so its really weird. I think the only logical solution would be that it was defined in the directx-sdk... any idea if dx does that/did that at some point?
EDIT: Appearently, at least when searching the SDK include dir for "nullptr" in notepad++, it doesn't show any hit. More ideas where this could come from? My version of VS here is german, the other one english, but both have the SP1 installed, I'm really out of ideas.