It was me! and could not understand it.
I did think "Hotkey" was Alt/f10 as in orignal game before vista.
It was me who got it wrong.
I used that function and got black screens then realised it would not work.
For some reason I had over 80 "dUMP" shots in my folder also which I had not taken myself. Which were black. It seems to have stopped doing it now I deleted them as well.
I did find the other function (print screen) Is that what you meant by Hotkey?/new screen shot function.
I don't know what you mean DDFIX ENABLED.. The shots with print screen are working as the two I posted.