In games no solution, but in Media Center some are getting black screens & one solution is to tinker with regedit.exe, but it didn't work for me with Il-2 and Vista 64.
Could it be a multi-monitor issue? Even if no monitor is hooked up and displaying anything is it possible the pc thinks there is a second monitor, which is obviously blank, and that is getting print-screened? Try setting nvidia control panel to single display mode, I dunno, I'm sure if it were so simple the answer would be on the net, but you never know.
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Have you tried setting the 'screen shot' key in your conf.ini and using IL2s screen capture feature? I've found that to be more reliable in the past, even on a plain installation.
---------------------------------- Flying online as 453_Whittle E8400 @3.8, 9800gtx+ Phenom II X4 B50 @ 3.4 Uni-joint / hall effect sensor stick guide: http://www.jpfiles.com/hardware/uni_stick.pdf