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After working through the tips provided by John, look at your Timeline very closely for gaps. When there is a "Failed to return... " error, it is most often associated with gaps (even one frame gaps) in the video. I zoom in to the "frame level" and step through the entire Timeline. If you use the PageUp/PageDown keys, you should see a smooth flow from Clip to Clip. If you get "pause," a "skip" or a "hesitation," you have probably found your gap.