I record a 1h40min flight which created two separated .MP4 files (VIRB0015.MP4 and VIRB0016.MP4). I found also two .GPX file (Track_2014-06-03 150155.gpx and Track_2014-06-03 140609.gpx). When I import the 2 video files, the first one (VIRB0015.MP4) is link to the same GPS track file of the second video. If I manually associate the first .GPX file with the first video file, it shows as a single point and no track despite I move ;-) (it's in a plane) and the video lasts 1h04min.
The first video file selected and the .GPX from the second part is associated :

Manual selection of the .GPX. See the 0 ft length, 6min13 duration (video lasts 1h04min) and single plot :

Furthermore, the exact same .GPX uploaded to GPS Visualizer web site (http://www.gpsvisualizer.com/) shows correctly :

How can I correct this faulty .GPX file and retrieve my track for this departure flight ?
Thanks in advance for your support.
VIRB EDIT 2.5.0.0
VIRB Elite software 3.7.0