I know I've had this same white capture problem a few days ago but I can't remember in what conditions exactly or what exactly changed since.
All I know is I have been fiddling a lot with dual display, overlay and so on...
Did you try to change the capture mode (meaning the convert captured images in software setting) ? I'm not sure what it does exactly (actually it didn't make a difference for me [tested on 1 movie only, so it's not worth much...])
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