When I upgraded VLC to the latest 2.2.0 version, the DLLs didn't match, and videos would show as a blank screen. Sometines the audio would play after a delay of 20-30 seconds, but sometimes never.
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Rolled back VLC to 2.0.4 and all seems oOK, though I still can't play MP4, I have to use WMV, but that's ok.
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Tom