When trying to print-screen in-game. the output file is black. no more, no less. Why does this happens?

When you press that it makes a screenshot for you in the games directory where screenshots go.

Oh, there they are :D
But why is my printscreen black? It's makes no sense.

Its like that with most games with win7 duno why.

I'm using vista. And WR is the only game this has happend to me.

Duno then sry, its a known issue in win7 and i think it happened in vista with a few games but i really cant remember that far back.