The movie is playing in video overlay memory. Most capture utils only see the usual screen image which by itself leaves you with an empty video frame.
This can be worked around depending on the program you're using for playback. Some have built-in frame capture. (i.e. Media Player Classic) Some just need to be told not to use video overlay. (it's a performance enhancement) In WMP open up tools->options->performance tab->advanced, and disable "use overlays."
You'll probably want to re-enable overlays after finishing your captures. At full screen it can make the difference between smooth and jerky video playback.
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There are a vast number of people who are uninformed and heavily propagandized, but fundamentally decent. The propaganda that inundates them is effective when unchallenged, but much of it goes only skin deep. If they can be brought to raise questions and apply their decent instincts and basic intelligence, many people quickly escape the confines of the doctrinal system and are willing to do something to help others who are really suffering and oppressed." -Manufacturing Consent: Noam Chomsky and the Media, p. 195
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