Screenshot only produces grey pictures

Somehow VVVV only produces grey pictures whenever I try to make a screenshot. (both ways, ctrl+1 and the classic print, then copy paste to photoshop). Might this be a problem with Windows7?

Mght, you can still connect dx9texture and use writer texture

most likely a driver problem as this basically works. try to update your driver or disable win7 aero desktop.

in fullscreen it happen all the time