System Information
Win7/64

Blender Version
blender-2.70-7fb33e5-win64

Short description of error
Adding a movie containing video+audio adds the audio strip to an already used channel.

Exact steps for others to reproduce the error

1. In the VSE, add a movie file containing both, video and audio.
2. Do the same again. Result: The audio strips of both video files are placed at channel 1.

Before adding second movie:

After adding second movie:

There's no difference in adding the movies via menu (Add->movie) or via drag&drop

Thank you in adavance.