I have the top window selected as video editing and the bottom window set as video sequence editor.
When I add a movie to the video sequence editor, it imports as a combined track with audio and video combined on one line. Without closing the project, if I add the same movie file to the same video sequence editor, it now imports as separate audio and video tracks. I have tried different movie clip sources and get the same result.
Is there a preset that causes this and/or is there a magic handshake that separates the first import, video from audio. I am using Blender 2.76 on Linux Mint 18.
Reset to Factory Defaults then CtrlU to save and all works now as expected.